What causes ADHD?
The exact cause attention deficit hyperactivity disorder (ADHD) is not known. However, it does tend to run in families and it is believed that genetically inheriting the condition is the most likely cause of it.
If a child has ADHD, both parents and the child’s siblings are 4 to 5 times more likely to have the condition.
ADHD is more common in males and children who were born prematurely.
There may also be a link with mothers who smoked or misused alcohol or drugs during pregnancy.
Can watching too much TV cause ADHD?
Some studies indicate that too much TV may be associated with ADHD. But some other studies contradict this.
The NHS says there's still not enough evidence to link TV to ADHD, but allowing children up to the age of 3 to watch several hours of TV everyday could contribute to attention problems.