Attention deficit hyperactivity disorder (ADHD) tends to run in families. Doctors who treat those with ADHD believe there may be a strong genetic link. However, while science has determined that some genetic variants raise the risk of having ADHD, researchers have not determined if environmental factors switch those genes on. Plus, scientists have not discovered a causal link with a specific gene. This means that an environmental trigger is likely necessary to causing ADHD.
What is ADHD?
ADHD stands for attention deficit hyperactivity disorder. A person who has it has difficulty focusing and staying on task. They may be able to focus well on tasks they find stimulating. This can lead to careless mistakes and difficulty coping in situations that require focus such as school or work. ADHD presents in 3 main categories:
ADHD, combined type. This, the most common type of ADHD, is characterized by impulsive and hyperactive behaviors as well as inattention and distractibility.
ADHD, impulsive/hyperactive type. This, the least common type of ADHD, is characterized by impulsive and hyperactive behaviors without inattention and distractibility.
ADHD, inattentive and distractible type. This type of ADHD is characterized predominately by inattention and distractibility without hyperactivity.
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