Q what is emesis and why it occurs?
Emesis is the medical term for vomiting. Vomiting is the forcible emptying of the stomach in which the stomach has to overcome the pressures that are normally in place to keep food and secretions within the stomach. Vomiting, along with nausea, is a symptom of an underlying disease rather than a specific illness itself. Causes of vomiting are varied and include pregnancy, food-borne illnesses, infections, some illness like pneumonia, heart attack, problems with the brain and central nervous system, side effect of some medicine treatment cancer therapy, radiation therapy.