I am going to give you a profile of a child and you can tell me if this sounds familiar:
This child does not need a lot of sleep and often times wakes up wired and ready to go. This child is sometimes literally bouncing off of the walls engaged in constant activity. Even while sitting, they are moving by popping up and down in their chair or kicking their legs. This child bumps into people and cannot stop touching people or objects in his environment. If this child is in a large room...

What Causes ADHD: Myths vs. Facts
10 Medical Conditions That Share Symptoms With ADD/ADHD
Common Symptoms of ADD & ADHD in Women
7 Behavior Modification Strategies for ADHD