Spasm
A spasmodic muscle contraction may be caused by many medical conditions, including dystonia.Spasms occur when the part of the brain that controls movement malfunctions, causing involuntary muscle activity.[citation needed] The cause of spasms is often unknown, but it can be due to an inherited genetic problem, a side effect of meds, Parkinson's disease, a stroke, cerebral palsy or multiple sclerosis.This is an episodic pain caused by spasm of smooth muscle in a particular organ (e.g., the bile duct).A characteristic of colic is the sensation of having to move about, and the pain may induce nausea or vomiting.