Light-headedness makes a person feel that he or she is about to
faint or pass out. It is caused by a momentary drop in blood pressure and blood
flow to the head.
Nausea or vomiting sometimes accompanies light-headedness. Symptoms
usually improve or go away after lying down.
It is common to feel light-headed occasionally. Light-headedness
often occurs when a person gets up too quickly from a seated or lying position
Unlike vertigo, light-headedness does not produce a sensation of
movement. Vertigo causes a spinning or whirling sensation that may lead to
nausea or vomiting, loss of balance, trouble walking or standing, and
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & Anne C. Poinier, MD - Internal Medicine & Adam Husney, MD - Family Medicine & David Messenger, MD