Home > Encyclopedia of Medicine > Nausea and Vomiting

Definition

Nausea is the sensation of being about to vomit. Vomiting, or emesis, is the expelling of undigested food through the mouth.

Description

Nausea is a reaction to a number of causes that include overeating, infection, or irritation of the throat or stomach lining. Persistent or recurrent nausea and vomiting should be checked by a doctor.

A doctor should be called if nausea and vomiting occur:

• after eating rich or spoiled food or taking a new medication
• repeatedly or for 48 hours or longer
• following intense dizziness

It is important to see a doctor if nausea and vomiting are accompanied by:

• yellowing of the skin and whites of the eyes
• pain in the chest or lower abdomen
• trouble with swallowing or...