Having an irresistible urge to move part of the body to stop uncomfortable or odd sensations in that part, is known as restless leg syndrome.
It's name comes from the most affected part of the body, legs and feet, but, the sensations can be felt in the arms and torso, too.
Was the onset of this restlessness slow or sudden?
Do you have periods free of restlessness, followed by new attacks of the same problem?
Do you take some meds?
Do you have some other medical problems?
Are you experiencing some other problems with your bowel movements?