As with children, if adults take a medication for ADHD, they often start with a stimulant medication. The stimulant medications affect the regulation of two neurotransmitters,

A very small proportion of people with ADHD have a neurological disorder called Tourette syndrome. People with Tourette syndrome have various nervous tics and repetitive mannerisms, such as eye blinks, facial twitches, or grimacing

As many as one in three children with ADHD also have other psychological or developmental conditions, including:

 The fact that the child exhibits ADHD-like behaviors does not prove that they are suffering from this disorder. It is quite possible that some other problem is causing these symptoms