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What cause of ADHD?

Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder that affects individuals of all ages. The root cause of ADHD is complex and not fully understood. However, experts suggest that a combination of genetic, environmental, and neurological factors contribute to the development of ADHD.

Firstly, genetics play a significant role in the development of ADHD. Studies have shown that the disorder is hereditary, with up to 70% of children with ADHD having a family history of the condition. Researchers have identified specific genes that are involved in the functioning of dopamine and norepinephrine, two neurotransmitters that help regulate mood, attention, and motivation.

Variations in these genes may cause imbalances in these neurotransmitters, leading to ADHD symptoms.

Secondly, environmental factors can also contribute to ADHD. Exposure to toxins such as cigarettes, alcohol, and lead during prenatal and early childhood periods may increase the risk of developing ADHD. Poor prenatal nutrition, low birth weight, and premature birth have also been linked to ADHD. There is also some evidence that ADHD may be related to certain food additives, such as artificial food coloring.

Lastly, brain structure and functioning can cause ADHD. The prefrontal cortex, which controls executive functions such as decision-making, planning, and impulse control, tends to be smaller and less active in individuals with ADHD. In contrast, the basal ganglia and the limbic system, which regulate movement and emotion respectively, may be overactive in ADHD.

Adhd is a complex disorder with a multifactorial etiology. Genetics, environmental factors, and neurological abnormalities all play a role in the development of ADHD. A better understanding of these underlying causes can help clinicians improve their diagnosis, treatment, and management of the condition.

Is ADHD a mental illness or coping mechanism?

ADHD (Attention Deficit Hyperactivity Disorder) is a neurodevelopmental disorder that affects a person’s ability to focus, organize, and control impulses. It is considered a mental illness by the medical community and is listed in the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders) as a mental health disorder.

The symptoms associated with ADHD can make life challenging for those who are affected by it. Children with ADHD may struggle in school, have difficulty with social interactions, and experience low self-esteem. Adults with ADHD may find it hard to maintain focus at work, maintain personal relationships, and experience a sense of restlessness or hyperactivity.

However, there has been debate in recent years about whether ADHD is solely a mental illness or if it can be seen as a coping mechanism. Some individuals with ADHD may have found ways to adapt to their symptoms and may even use them to their advantage. For example, some individuals may use their hyperactivity to excel in sports or certain types of jobs that require high energy levels.

Others may use their impulsivity to take risks and pursue their passions.

Additionally, research has shown that individuals with ADHD may have some unique strengths, such as creativity and adaptability, that can also be seen as coping mechanisms. These traits are often overlooked when discussing ADHD and may offer insights into the positive aspects of having the disorder.

Adhd is typically considered a mental illness, but it is also important to recognize that individuals with ADHD may develop coping mechanisms that help them navigate the challenges associated with their symptoms. These coping mechanisms may involve embracing their unique strengths and finding ways to adapt to their challenges.

understanding the complexity of ADHD can help individuals with the disorder and those around them better appreciate their strengths, challenges, and experiences.

What is ADHD caused by in the brain?

Attention-deficit/hyperactivity disorder (ADHD) is a complex and multifactorial disorder that affects millions of individuals around the world. While the exact cause of ADHD is not fully understood, many studies suggest that ADHD is caused by a combination of genetic, neurobiological, and environmental factors.

One of the most significant factors that contribute to the development of ADHD is genetics. Studies have shown that ADHD has a strong genetic component, with heritability rates estimated to be around 60-80%. This means that if one or both parents have ADHD, their children are more likely to develop the disorder as well.

ADHD is also associated with abnormalities in certain regions of the brain, particularly the prefrontal cortex, basal ganglia, and cerebellum. In individuals with ADHD, these regions of the brain are often underactive or display reduced blood flow, which can affect the ability to regulate attention, emotions, and behavior.

Specifically, the prefrontal cortex is responsible for executive functions such as planning, organization, decision-making, and impulse control. It also plays a critical role in regulating attention and inhibiting irrelevant or distracting information. In individuals with ADHD, the prefrontal cortex may have trouble filtering out distractions and regulating impulses, leading to problems with attention and behavior.

The basal ganglia, which are located deep within the brain, are responsible for controlling movement and coordinating motor activity. Some studies have suggested that ADHD may be related to abnormal functioning of these structures, leading to hyperactivity and impulsivity.

Lastly, the cerebellum, located at the back of the brain, is responsible for coordinating motor movements and balance. Some research has linked ADHD to abnormalities in the cerebellum, which may contribute to the motor symptoms of ADHD such as restlessness and fidgeting.

While the exact cause of ADHD is still not fully understood, research suggests that it is likely caused by a complex interplay of genetic, neurobiological, and environmental factors. Understanding the underlying mechanisms that contribute to ADHD can help to develop more effective treatments and interventions for individuals with this disorder.

What is an example of Aristotle’s four causes?

Aristotle’s theory of causality is a highly influential philosophical framework that aims to explore the fundamental nature of causation. According to Aristotle, everything in nature can be explained in terms of four “causes” or explanations, which are the material cause, formal cause, efficient cause, and final cause.

These four causes can be understood as different aspects or dimensions of an object or occurrence that work together to produce its existence or behavior.

One example of Aristotle’s four causes can be seen in the construction of a building. Firstly, the material cause of the building would be the physical matter used to build it. For instance, bricks, concrete, stone, metal, and so on. Without these materials, the building would not exist.

Secondly, the formal cause of the building would be its design, plan, or blueprint. This explains the essential form or structure of the building, which is crucial for its creation. A building cannot be built without a blueprint or design.

Thirdly, the efficient cause of the building would be the labor or physical work done by the builders or architects to construct the building. They are the agents that bring the materials and plan together to produce the building. Without their labor, the building would not be created.

Finally, the final cause of the building would be its purpose or function. For instance, the building might be a hospital, a school, or a house. The final cause would explain why the building was constructed in the first place, and how it would be used to fulfill its intended purpose. Without this purpose, the building would not be needed.

Aristotle’S four causes can be seen in the endeavor to construct a building. The material cause is the matter used to build it, the formal cause is its design or plan, the efficient cause is the workers who build it, and the final cause is its purpose or function. By examining these four causes, Aristotle believed that one could gain a deeper understanding of the nature of objects and their existence.

What 4 areas can teachers focus on to support students with ADHD?

Attention Deficit Hyperactivity Disorder (ADHD) is a neurobehavioral condition that affects millions of children worldwide. It is characterized by symptoms such as hyperactivity, inattention, and impulsivity, which can make it difficult for students with ADHD to learn and succeed academically. However, with the right support and guidance from their teachers, students with ADHD can reach their full potential.

Here are four areas that teachers can focus on to help support students with ADHD:

1. Creating a supportive learning environment

A supportive learning environment is essential for all students but is especially important for those with ADHD. Teachers can create a supportive learning environment by providing structure and routine in the classroom that helps students with ADHD feel organized and secure. They can also make sure that classroom rules are clear and consistent, and that students understand the consequences of breaking those rules.

Teachers can offer positive feedback and reinforce good behavior, which can help students with ADHD feel more confident in their abilities.

2. Adapting teaching methods and materials

Students with ADHD often benefit from different teaching methods than their non-ADHD peers. Teachers can adapt their teaching methods to meet the unique needs of students with ADHD. For example, they can use visual aids to help students with ADHD understand concepts better, incorporate hands-on and interactive activities to keep students engaged and focused, and use repetition to reinforce key concepts.

Teachers can also provide options for students to work independently or collaboratively and give them a choice of where to sit in the classroom.

3. Developing individualized learning plans

Individualized learning plans can be helpful for students with ADHD, as they allow teachers to tailor their teaching to meet each student’s specific needs. Teachers can collaborate with parents and students to develop individualized learning plans that include specific goals, accommodations, and strategies that support the student’s learning.

For example, the plan may include strategies to help the student stay organized, such as a color-coded planner or a checklist, or accommodations such as extra time on tests. By creating individualized learning plans, teachers can help students with ADHD feel more supported and gain a sense of control over their learning.

4. Communicating with parents and other educators

Collaboration between teachers, parents, and other educators is crucial to supporting students with ADHD. Teachers can share information about a student’s progress and any challenges they may be having with parents and other educators to ensure everyone is working together to support the student. Regular communication between teachers and parents can help teachers understand the student’s home life and any factors that may be impacting their learning.

Teachers can also collaborate with other educators, such as special education teachers or school psychologists, to develop effective strategies to support students with ADHD.

Teachers can support students with ADHD by creating a supportive learning environment, adapting teaching methods and materials, developing individualized learning plans, and collaborating with parents and other educators. By focusing on these areas, teachers can help students with ADHD succeed academically and reach their full potential.

How does ADHD manifest in the classroom?

ADHD, or Attention Deficit Hyperactivity Disorder, is a neurodevelopmental disorder that affects a person’s ability to focus and concentrate on a specific task. ADHD can manifest in the classroom in various ways, making it difficult for students with ADHD to learn and perform to the best of their ability.

One common manifestation of ADHD in the classroom is difficulty with sustained attention. Students with ADHD often have trouble staying focused on a lesson, a reading assignment, or even a conversation with their teacher or peers. They may get easily distracted by external stimuli such as noise, movement, or even their own thoughts.

As a result, they may miss important information and instructions, leading to a lack of understanding and lower academic performance.

Another manifestation of ADHD in the classroom is impulsivity. Students with ADHD may act impulsively, without thinking through the consequences of their actions. For example, they may blurt out answers without raising their hand, interrupt their teacher or peers, or start working on a task before fully understanding the instructions.

This can disrupt the classroom environment, making it hard for the teacher and other students to focus and learn.

Hyperactivity is also a common manifestation of ADHD in the classroom. Hyperactive students may fidget, squirm, or move around in their seat incessantly, making it challenging for them to remain seated and focused. They may also get up from their seat, walk around the classroom, or even run or climb when it is not appropriate or safe to do so.

Their hyperactivity can be a distraction to the learning process for other students in the classroom.

In addition to these manifestations, students with ADHD may struggle with organization and time-management skills, which can make it difficult to complete assignments and stay on task in the classroom. They may also have difficulty following multi-step instructions or handling transitions between activities, which can lead to frustration and anxiety.

It is essential for teachers and school administrators to recognize the signs and manifestations of ADHD in the classroom and provide support and accommodations to help students with ADHD succeed. This may include accommodations such as extra time for assignments, preferential seating, breaks, or a quiet area for test-taking.

Collaborating with parents, counselors, and other professionals can also provide tailored support to students who need it. By recognizing and addressing ADHD in the classroom, educators and school administrators can empower students with ADHD to reach their full potential.

What are the four components that are needed in identifying students with ADHD?

Attention Deficit Hyperactivity Disorder (ADHD) is a common neurodevelopmental disorder found in children and adults. ADHD can cause difficulties in a variety of areas, including academic performance, social relationships, and self-esteem. When it comes to identifying students with ADHD, there are four primary components that are needed.

These components are assessment, observation, collaboration, and time.

The first component, assessment, is a critical element in identifying students with ADHD. Assessment involves gathering information about the student’s behavior and comparing it to the expected developmental range for that particular age group. In addition to this, assessment also involves collecting information from various sources such as the student, their parents, and their teachers.

Assessment tools that can be used to diagnose ADHD include the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), the Conners Comprehensive Behavior Rating Scale, and the Vanderbilt Rating Scale.

The second component, observation, is also a crucial part of identifying students with ADHD. Observing a student’s behavior in different settings can help to identify ADHD symptoms. For instance, observing the student in the classroom, during recess, or social interactions can provide critical information about their behaviors that may indicate ADHD.

Through observation, teachers, parents, and mental health professionals can identify behaviors such as inattention, hyperactivity, impulsivity, and lack of organization, which are typical of ADHD.

Collaboration is the third component that is essential in identifying ADHD among students. Collaboration involves different stakeholders such as the student’s parents, school psychologists, teachers, and medical professionals working together to identify ADHD symptoms, develop an intervention plan, and monitor the student’s progress.

Collaboration is critical since it helps to provide a more comprehensive view of the student’s symptoms and ensures that everyone is working towards the same goal.

The fourth component, time, is a final but important component in identifying ADHD in students. Time is needed since ADHD is often misdiagnosed, and symptoms may not be evident immediately. Therefore, it is essential to observe the student’s behavior over an extended period to identify whether symptoms are consistent and persistent.

Observing a student’s behavior for at least six months can help to identify ADHD and distinguish it from other conditions with similar symptoms such as anxiety or depression.

Identifying students with ADHD requires a comprehensive approach that involves assessment, observation, collaboration, and time. With these four components, parents, teachers, and mental health professionals can identify ADHD and provide the necessary interventions to help the student manage their symptoms better.

Identifying ADHD in students is critical since early identification and intervention can help the student improve academically, socially, and emotionally while at school and beyond.

Are you born with ADHD or is it caused?

Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder that affects millions of people worldwide. The question of whether someone is born with ADHD or it is caused is one that is still being researched and debated by medical professionals. Some studies suggest that ADHD is a genetic disorder that a person can inherit from their parents, while others suggest that environmental factors can contribute to the development of ADHD.

Research has shown that there is a genetic component to ADHD. According to the National Institute of Mental Health (NIMH), ADHD runs in families, and children who have a parent or sibling with ADHD are more likely to develop the disorder. Furthermore, a number of genes have been identified that are associated with the development of ADHD.

These genes are involved in the regulation of neurotransmitters, which are chemicals in the brain that affect mood, behavior, and attention.

However, genetics alone cannot fully explain the development of ADHD. Environmental factors, such as exposure to toxins, maternal smoking during pregnancy, and premature birth have been linked to an increased risk of ADHD. Additionally, studies have shown that children who experience neglect, abuse, or trauma are more likely to develop ADHD and other mental health disorders.

These environmental factors can disrupt normal brain development and lead to changes in the brain’s structure and function.

While genetics may play a role in the development of ADHD, it is likely a combination of both genetic and environmental factors that contribute to the disorder. Further research is needed to fully understand the complex interplay between these factors and how they affect the development of ADHD. Regardless of the cause, it is important for individuals with ADHD to receive proper diagnosis and treatment to manage their symptoms and improve their quality of life.

Can you get ADHD without being born with it?

Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder that primarily affects children, although it can persist into adulthood. ADHD is believed to be a genetic condition, meaning it is largely present at birth. However, there are some situations where one can develop ADHD symptoms without being born with the disorder.

For instance, a traumatic brain injury or certain medical conditions such as epilepsy, stroke, or brain tumors can result in ADHD-like symptoms. In such incidences, the symptoms of inattention, hyperactivity, and impulsivity may arise after a specific event at any age. In rare cases, misuse of certain drugs or substances like alcohol, cocaine, or inhalants can also lead to symptoms that resemble ADHD.

Additionally, some individuals may exhibit ADHD-like symptoms due to environmental factors such as stressful family situations or lead poisoning. The symptoms of ADHD may also be more apparent or pronounced in individuals with learning disabilities or other pre-existing medical conditions.

Therefore, while ADHD is primarily considered to be a congenital disorder, there are situations where one can develop ADHD behaviors without being born with the condition. It is crucial for individuals or parents suspecting ADHD-like symptoms to seek professional medical help to determine the underlying cause or condition and subsequently receive the right diagnosis and treatment.

Can you develop ADHD later in life or are you born with it?

Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder that affects people’s ability to pay attention, control impulsive behavior, and regulate their emotions. The disorder is usually diagnosed in childhood, but it is possible to develop ADHD later in life.

There is no one cause of ADHD. Research shows that it is a complex disorder that results from a combination of genetic, environmental, and neurological factors. Some people may be born with a genetic predisposition to ADHD, which means that they are more likely to develop the disorder than others. However, not all people with ADHD have a family history of the disorder, which suggests that environmental factors also play a role.

While ADHD is typically diagnosed in childhood, it is not uncommon for adults to receive a diagnosis later in life. In fact, some people may go undiagnosed until adulthood because they have learned to cope with their symptoms, or their symptoms may have been dismissed as laziness or a lack of motivation.

In other cases, people may develop ADHD later in life due to changes in their brain chemistry, hormonal imbalances, or other medical conditions.

ADHD can have a significant impact on a person’s life, regardless of when they are diagnosed. While the symptoms of the disorder may change over time, they can still interfere with a person’s ability to function on a daily basis. However, it is possible to manage ADHD symptoms with a combination of medication, therapy, and lifestyle changes.

Many people with ADHD are able to lead fulfilling lives by learning coping strategies, seeking support from family and friends, and working with mental health professionals to develop treatment plans that meet their individual needs.

While ADHD is typically diagnosed in childhood, it is possible to develop the disorder later in life. ADHD is a complex disorder that results from a combination of genetic, environmental, and neurological factors. However, with the right support and treatment, people with ADHD can learn to manage their symptoms and lead fulfilling lives.

Which parent passes down ADHD?

ADHD is a neurodevelopmental disorder that affects both children and adults. It is characterized by inattention, hyperactivity, and impulsivity symptoms that significantly impair an individual’s daily functioning.

Research suggests that ADHD has a strong hereditary component, and genetic factors are known to play a significant role in the disorder’s development. Most studies have indicated that ADHD is passed down through families from one generation to the next. It is estimated that 70-80% of cases of ADHD have a genetic component.

While it is challenging to identify a single parent who passes down ADHD, research shows that both parents can contribute to the disorder’s inheritance. It is believed that multiple genes contribute to the development of ADHD, and genetic inheritance patterns may differ from one family to another.

Research has also linked specific genetic variants with ADHD, including the dopamine receptor D4 (DRD4) and dopamine transporter (DAT) genes. These genes are involved in regulating the brain’s dopamine neurotransmitter system, which plays a crucial role in attention, motivation, and reward.

In addition to genetic factors, environmental and lifestyle factors can affect ADHD risk. Studies have shown that maternal stress during pregnancy, premature birth, low birth weight, and exposure to environmental toxins can increase the risk of developing ADHD.

While both parents can pass down ADHD to their children, it is a complex disorder that results from a combination of genetic, environmental, and lifestyle factors. Identifying risk factors and early intervention can improve outcomes for children and adults living with the disorder.

Can ADHD go away?

Attention Deficit Hyperactivity Disorder (ADHD) is a medical condition that affects both children and adults. It is characterized by symptoms such as difficulty concentrating, impulsiveness, and hyperactivity. While there is currently no known cure for ADHD, it is possible for the symptoms to diminish and become less severe over time.

Studies show that approximately 60% of children who are diagnosed with ADHD continue to exhibit symptoms in adulthood. However, some individuals may experience a decrease in the severity of their symptoms as they age. In other cases, symptoms may persist but can be managed through medications or behavioral therapy.

There is also evidence to suggest that certain lifestyle changes and interventions can help reduce symptoms of ADHD. For example, regular exercise has been shown to improve attention and reduce hyperactivity in children with ADHD. Good nutrition, adequate sleep, and stress management techniques can also be helpful in managing symptoms.

It is important to note that ADHD is a complex condition, and individual experiences may vary. Some people may find that their symptoms remain stable throughout their life, while others may experience significant changes over time. Additionally, the effectiveness of treatment approaches may vary among individuals.

Therefore, it is crucial to continue seeking medical advice and support in managing ADHD symptoms.

While ADHD does not go away completely, it is possible for symptoms to improve or become more manageable over time with the right interventions and support. The most effective approach to managing symptoms may involve a combination of medication, therapy, lifestyle changes, and educational and vocational support.

With a comprehensive and individualized treatment approach, individuals with ADHD can lead successful and fulfilling lives.

Can a normal person develop ADHD?

Yes, it is possible for a normal person to develop Attention Deficit Hyperactivity Disorder (ADHD). While it is known to most people as a childhood disorder, ADHD can also manifest in adulthood, and in some cases, it may develop in individuals who had no prior signs of ADHD or showed only mild symptoms in childhood.

It is believed that ADHD can be caused by various factors such as genetic, neurological, environmental, and even lifestyle factors. For example, a person may have a genetic predisposition to ADHD, meaning they have inherited genes that increase their likelihood of developing the disorder. However, this doesn’t mean that the person will definitely develop ADHD – it simply means they have an increased risk.

The trigger for the actual condition may be a combination of environmental factors, such as exposure to toxins, traumatic experiences or brain injury, and lifestyle factors such as poor nutrition, lack of sleep, or substance abuse.

In some cases, people may not have shown symptoms of ADHD in childhood, but start exhibiting symptoms as an adult. This is often referred to as late-onset ADHD, and it can be challenging to diagnose as the symptoms can seem similar to other disorders or mental health conditions.

Adults with ADHD may struggle with a variety of symptoms that include inability to focus, impulsivity, and hyperactivity. They may have difficulty completing tasks or focusing on demanding work, leading to frequent misunderstandings and conflicts with colleagues or superiors. Additionally, they may find themselves procrastinating or failing to complete tasks that don’t offer immediate rewards or are not of immediate interest to them.

Fortunately, there are various treatments available for adult ADHD that can help manage the symptoms’ impact on daily life. Medications, therapy, and cognitive-behavioral approaches have been found to be effective in managing ADHD in adults. However, it is essential that people seek a professional diagnosis and treatment plan from mental health experts for best management of the disorder.

Can ADHD be a learned behavior?

There is ongoing debate among experts about whether ADHD, or attention-deficit/hyperactivity disorder, can be considered a learned behavior. While genes play a significant role in the development of ADHD, environmental factors can also contribute to the disorder’s symptoms. Some researchers suggest that specific behaviors, such as impulsivity or inattention, can be learned through early experiences or environmental stressors.

Studies have shown that environmental factors related to parenting, education, and socioeconomic status influence the prevalence of ADHD. Children who come from disadvantaged backgrounds may experience chronic stress and other adverse childhood experiences, which have been linked to a higher likelihood of developing the disorder.

Additionally, parenting practices that emphasize strict punishment, neglect, or inconsistent discipline may also contribute to ADHD behaviors.

However, it is important to note that there is no clear causation between specific environmental factors and ADHD. While research indicates that certain children may be more susceptible to ADHD, it is ultimately a complex condition with multiple contributing factors.

It is also important to differentiate between learned behaviors and symptoms of ADHD. While some behaviors may appear similar, such as impulsivity or inattention, ADHD is a neurodevelopmental disorder that affects brain function. The disorder is characterized by persistent and severe symptoms that significantly impair daily functioning.

Overall, while environmental factors can influence behavior and potentially exacerbate symptoms of ADHD, it is not accurate to say that ADHD is strictly a learned behavior. The complex interplay of genetic, biological, and environmental factors make it difficult to pinpoint any one cause of ADHD. Effective treatment for ADHD typically involves a multi-faceted approach that addresses both the underlying neurobiological factors and environmental factors that may be contributing to symptoms.

Can you develop ADHD as a teenager?

Yes, it is possible for someone to develop ADHD as a teenager. ADHD, or Attention Deficit Hyperactivity Disorder, is a neurodevelopmental disorder that typically manifests in childhood. However, some individuals with ADHD may not receive a diagnosis until they are teenagers or even adults.

The symptoms of ADHD include difficulty paying attention, hyperactivity, and impulsivity. These symptoms can have a profound impact on a teenager’s academic performance, social interactions, and overall quality of life. Some teenagers with ADHD may struggle to stay focused in class, complete homework assignments, and organize their time effectively.

They may also have difficulty controlling their impulses and may engage in impulsive behaviors such as substance abuse or risky sexual behavior.

The causes of ADHD are not well understood, but research suggests that a combination of genetic and environmental factors may play a role. Factors such as prenatal exposure to toxins, premature birth, and a family history of ADHD may increase a teenager’s risk of developing the disorder.

It is important for teenagers who are experiencing symptoms of ADHD to seek help from a healthcare professional. A diagnosis can be made through an evaluation that includes a medical exam, a mental health assessment, and a review of the teenager’s symptoms and medical history. Treatment for ADHD may include medication, behavioral therapy, or a combination of both.

With proper treatment and support, many teenagers with ADHD are able to manage their symptoms and achieve success in school and beyond.

Adhd can develop in teenagers and often goes undiagnosed until later in life. It is important for teenagers experiencing symptoms of ADHD to seek help from a healthcare professional to receive a proper diagnosis and treatment.

Resources

  1. Attention deficit hyperactivity disorder (ADHD) – Causes – NHS
  2. Causes of ADHD: What We Know Today – HealthyChildren.org
  3. Attention-deficit/hyperactivity disorder (ADHD) in children
  4. What causes attention deficit hyperactivity disorder? – PMC
  5. The 3 Causes of ADHD