It may vary with age. You might be able to notice it in preschoolers. ADHD symptoms nearly always show up before middle school.

Kids with hyperactivity may:

• Fidget and squirm when seated.
• Get up frequently to walk or run around.
• Run or climb a lot when it’s not appropriate. (In teens this may seem like restlessness.)
• Have trouble playing quietly or doing quiet hobbies
• Always be “on the go”
• Talk excessively

Toddlers and preschoolers with ADHD tend to be constantly in motion, jumping on furniture and having trouble participating in group activities that call for them to sit still. For instance, they may have a hard time listening to a story.

School-age children have similar habits, but you may notice those less often. They are unable to stay seated, squirm a lot, fidget, or talk a lot.

Hyperactivity can show up as feelings of restlessness in teens and adults. They may also have a hard time doing quiet activities where you sit still.