Irritable bowel syndrome (IBS) is a group of symptoms-including abdominal pain and changes in the pattern of bowel movements without any evidence of underlying damage.
A tremor is an involuntary, somewhat rhythmic, muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts.
Vomiting, also known as emesis and throwing up, among other terms, is the involuntary, forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose.