Unexplained fainting spells need to be checked by a doctor. This can cause fainting spells (syncope). Sometimes the cause of light-headedness is an abnormal heart rhythm ( arrhythmia). Heavy menstrual bleeding also can cause this type of light-headedness. When this happens, light-headedness and fatigue may be the first signs that you are losing blood. You may have small amounts of bleeding in your digestive tract over days or weeks without noticing the bleeding. But sometimes bleeding isn't obvious (occult bleeding). Most of the time, the location of the bleeding and the need to seek medical care are clear.

The use of tobacco, alcohol, or other drugs.Ī more serious cause is bleeding.

Very deep or rapid breathing ( hyperventilation).

Vomiting, diarrhea, fevers, and other illnesses that cause dehydration.

Home treatment of your flu and cold symptoms usually will relieve light-headedness.

Illnesses such as influenza (flu) or colds.

Light-headedness that lasts may mean that you have a more serious problem that needs to be checked. This can occur when you get up too quickly from a seated or lying position ( orthostatic hypotension). Light-headedness often is caused by a quick drop in blood pressure and blood flow to your head. Brief bouts of light-headedness aren't usually caused by a serious problem. It's common to feel light-headed from time to time. Dizziness can also lead to falls and other injuries. A fear of dizziness can cause older adults to limit their physical and social activities. And you may lose your balance and fall.ĭizziness can occur in people of any age. You may have trouble walking or standing. When you have severe vertigo, you may feel very nauseated or vomit. You may feel as though you are off balance, spinning, whirling, falling, or tilting.

Vertigo is a feeling that you or your surroundings are moving when there is no actual movement.

You may sometimes feel nauseated or vomit when you are light-headed. If it gets worse, it can lead to a feeling of almost fainting or to a fainting spell ( syncope). The feeling often goes away or improves when you lie down. But you don't feel as though you or your surroundings are moving.

Light-headedness is a feeling that you are about to faint or 'pass out.' You may feel dizzy.

It's important to know exactly what you mean when you say 'I feel dizzy.' It can help you and your doctor narrow down the list of possible problems.

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Centers for Disease Control and Prevention. American Headache Society Committee for Headache Education. Headache emergencies: Diagnosis and management.

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