The following information is provided by the National Institute of Mental Health
"People with ADHD experience an ongoing pattern of the following types of symptoms:
- Inattention–having difficulty paying attention
- Hyperactivity–having too much energy or moving and talking too much
- Impulsivity–acting without thinking or having difficulty with self-control
Some people with ADHD mainly have symptoms of inattention. Others mostly have symptoms of hyperactivity-impulsivity. Some people have both types of symptoms.
Signs of inattention may include challenges with:
- Paying close attention to details or making seemingly careless mistakes at work or during other activities
- Sustaining attention for long tasks, such as preparing reports, completing forms, or reviewing lengthy papers
- Listening closely when spoken to directly
- Following instructions and finishing duties in the workplace
- Organizing tasks and activities and managing time
- Engaging in tasks that require sustained attention
- Losing things such as keys, wallets, and phones
- Being easily distracted by unrelated thoughts or stimuli
- Being forgetful in daily activities, such as paying bills, keeping appointments, or returning calls
Signs of hyperactivity and impulsivity may include:
- Experiencing extreme restlessness, difficulty sitting still for extended periods, and/or wearing others out with one’s activity
- Fidgeting with or tapping hands or feet or squirming in seat
- Being unable to engage quietly in leisure activities
- Talking excessively
- Answering questions before they are asked completely
- Having difficulty waiting one’s turn, such as when waiting in line
- Interrupting or intruding on others"
(From the National Institute of Mental Health)