Lightheadedness

Definition
Lightheadedness is a reeling sensation, caused by a temporary decrease in blood flow to the brain.

Alternative Names
Lightheaded.

Synopsis
Feeling lightheaded is a sensation that may precede syncope or fainting. It is usually experienced when in an upright position (standing or sitting). If it occurs when you are lying down, then the cause may be more serious. One may have the sense the floor is moving or the room is spinning. Because the sensation is often related to a momentary decreased blood flow to the brain, the sensation can usually be remedied by getting into a horizontal position.

Associated Diagnoses
Bleeding
High blood pressure
Heart arrythmias
Anemia
Heart attack
Pregnancy
Abdominal aortic aneurysm
Acute mountain sickness
Anxiety
Vertigo
Transient ischemic attack (TIA)
Depression