Dizziness is a term that is often used to describe two different
symptoms: lightheadedness and vertigo. Light-headedness is a
feeling like you might faint. Vertigo is a feeling that you are
spinning or moving, or that the the world is spinning around
you. See also: Light-headedness - dizzy; Loss of balance;
Vertigo Most causes of dizziness are not serious and either
quickly get better on their own or are easily treated. Light-
headedness occurs when your brain does not get enough blood.
This may occur if: You have a sudden drop in blood pressure Your
body does not have enough water (is dehydrated) because of
vomiting, diarrhea, fever, and other conditions You get up too
quickly after sitting or lying down (this is more common in
older people) Light-headedness may also occur if you have the
flu, low blood sugar, a cold, or allergies. More serious
conditions that can lead to light-headedness include: Heart
problems, such as a heart attack or abnormal heart beat Bleeding
inside the body Shock (extreme drop in blo