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An allergic reaction occurs when the immune system reacts to something that rarely affects most people. Substances and environmental conditions can cause allergies, including the most popular type known as hay fever.
Attention deficit hyperactivity disorder (ADHD) is a mental disorder that can cause over-normal levels of hyperactive and impulsive behaviour. People with ADHD have difficulty concentrating on a task or sitting still for prolonged periods of time.
Attention deficit hyperactivity disorder, also known as ADHD, affects millions of children and also continues to develop in adulthood. However, diagnosis typically occurs during primary school years.
ADHD or attention deficit hyperactivity disorder is one of the most common mental disorder in children. Inattentiveness, impulsivity, and hyperactivity are the symptoms of ADHD.
People with ADHD sometimes face other conditions. You may also have learning disabilities, anxiety or other mood disorders such as obsessive-compulsive disorders, or dependency on drugs or alcohol.