A child with ADHD inattentive type has most or all of following symptoms, excluding situations where these symptoms are better explained by another psychiatric or medical condition:

• Be easily distracted, miss details, forget things, and frequently switch from one activity to another
• Have difficulty maintaining focus on one task
• Become bored with a task after only a few minutes, unless doing something they find enjoyable
• Have difficulty focusing attention on organizing or completing a task
• Have trouble completing or turning in homework assignments, often losing things (e.g., pencils, toys, assignments) needed to complete tasks or activities
• Appear not to be listening when spoken to
• Daydream, become easily confused, and move slowly
• Have difficulty processing information as quickly and accurately as others
• Struggle to follow instructions
• Have trouble understanding details; overlooks details

A child with ADHD hyperactive-impulsive type has most or all of the following symptoms, excluding situations where these symptoms are better explained by another psychiatric or medical condition:

• Fidget or squirm a great deal
• Talk nonstop
• Dash around, touching or playing with anything and everything in sight
• Have trouble sitting still during dinner, school, doing homework, and story time
• Be constantly in motion
• Have difficulty performing quiet tasks or activities
• Be impatient
• Blurt out inappropriate comments, show their emotions without restraint, and act without regard for consequences
• Have difficulty waiting for things they want or waiting their turn in games
• Often interrupt conversations or others' activities

Girls tend to have less hyperactivity, inattention, and impulsivity but greater symptoms pertaining to inattention and distractability. Symptoms of hyperactivity tend to go away with age and turn into "inner restlessness" in teens and adults with ADHD.

People with ADHD of all ages are more likely to have problems with social skills, such