Nausea is the sensation of having an urge to vomit. Vomiting is forcing the contents of the stomach up through the esophagus and out of the mouth.
Emesis; Vomiting; Stomach upset; Upset stomach
Your body has a few main ways to respond to an ever-changing, wide variety of invaders and irritants. Sneezing ejects the intruders from the nose, coughing from the lungs and throat, diarrhea from the intestines, and vomiting from the stomach.
Vomiting is a forceful action accomplished by a fierce, downward contraction of the diaphragm muscle. At the same time, the abdominal muscles tighten against a relaxed stomach with an open gastroesophageal sphincter. The contents of the stomach are propelled up and out.
As part of a bodily reflex, you may produce more saliva just before vomiting.
Vomiting is a complex, coordinated reflex orchestrated by the vomiting center of the brain. It responds to signals coming from:
Review Date: 10/20/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and George F. Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program, San Diego, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.