The problem: Children with ADHD are in constant motion. It is difficult for them to sit still for long periods of time so they may squirm in their seats, kick their desk legs, or stand up or pace while working. Often, they talk excessively or make noises while trying to sit still.
The reason: ADHD kids' bodies and minds are like motors on the go. One study of ADHD boys showed that they moved around the room eight times as often as other boys, making twice as many arm motions. They were also four times as fidgety and wiggly while seated for psychological testing.
The obstacles: Impaired motor control centers in the brain are the suspected cause of fidgety, hyperactive behavior.
Impulse-control problems also play a part; hyperactive children are unable to inhibit the impulse to move around. You can tell them to sit still or stop talking, but the behaviors may reappear within minutes.