Vomiting is a forceful expulsion of stomach contents through an upward direction. Vomiting itself is not a condition. Chronic nausea and vomiting represent a diverse array of diseases which might be the causative factor.
Nausea is the preceding symptom of vomiting. It is the feeling that one is about to vomit but does not always end up in, vomiting. Antiemetic are the drugs used to suppress or stop nausea and vomiting. In the case of severity, where dehydration develops, intravenous fluid may be required. Self-induced vomiting can be a part of an eating disorder, Bulimia nervosa, where the individual throws up the food taken.
Although Vomiting and Regurgitation are often used interchangeably, both convey a different meaning. Regurgitation implies the return of undigested food back up the esophagus to the mouth, without any force and displeasure associated with vomiting. Generally, the causes of vomiting and regurgitation vary.