Attention-deficit/hyperactivity disorder (ADHD) is one of the most common mental disorders affecting
children. ADHD also affects many adults. Symptoms of ADHD include inattention (not being able to
keep focus), hyperactivity (excess movement that is not fitting to the setting) and impulsivity (hasty acts
that occur in the moment without thought).
An estimated 8.4 percent of children and 2.5 percent of adults have ADHD. 1,2 ADHD is often first
identified in school-aged children when it leads to disruption in the classroom or problems with
schoolwork. It can also affect adults. It is more common among boys than girls.
ADHD is diagnosed as one of three types: inattentive type, hyperactive/impulsive type or combined type.
Inattentive type – (five for people over 17 years) of the following symptoms occur frequently:
- Difficulty paying close attention to details or has careless mistakes in school or job tasks.
- Has problems staying focused on tasks or activities, such as during lectures, conversations or long
- Does not seem to listen when spoken to (i.e., seems to be elsewhere).
- Does not follow through on instructions given at school, home, or job duties (may start tasks but
quickly loses focus).
- Has problems organizing tasks and work (for instance, does not manage time well; has messy,
disorganized work; misses deadlines).
- Avoids or dislikes tasks that require sustained mental effort, such as preparing reports and
- Often loses things needed for tasks or daily life, such as school papers, books, keys, wallet, cell
phone and eyeglasses.
- Is easily distracted.
- Forgets daily tasks, such as doing chores and running errands. Older teens and adults may forget to return phone calls, pay bills and keep appointments.
Hyperactive/impulsive type – (five for people over 17 years) of the following symptoms occur frequently:
- Fidgets with or taps hands or feet, or squirms in seat.
- Not able to stay seated (in classroom, workplace).
- Runs about or climbs where it is inappropriate.
- Unable to play or do leisure activities quietly.
- Always “on the go,” as if driven by a motor.
- Talks too much.
- Blurts out an answer before a question has been finished (for instance may finish people’s
sentences, cannot wait to speak in conversations).
- Has difficulty waiting his or her turn, such as while waiting in line.
- Interrupts or intrudes on others (for instance, cuts into conversations, games or activities, or starts
using other people’s things without permission). Older teens and adults may take over what
others are doing.