2009-11-05 01:17:49 -

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Fainting occurs when there is Insufficient oxygen reaching the brain. This causes a sudden and temporary loss of consciousness.

Causes of Fainting


Numerous causes may produce fainting. These include a sudden decrease in blood flow to the brain, resulting from heartbeat abnormalities or diseases that limit the amount of blood that the heart pumps. Prolonged straining, such as from severe coughing or

attempted bowel movements when constipated, can reduce blood flow to the heart and lead to fainting. Sudden emotional stress can lead to neurological output that produces fainting by slowing the heart and output of the heart. Rapidly rising from sitting or lying down, especially in chronically ill or bed ridden patients, can produce orthostatic hypotension. This leads to fainting. Hypoglycemia, severe pain and heart attack can all produce temporary loss of consciousness or fainting.

Signs and Symptoms of Fainting


Symptoms of fainting include sudden light-headedness, general weakness and falling. Blurred vision, nausea, pallor and sweating frequently occur. There is usually a rapid heart beat and rapid breathing. In the absence of heartbeat or breathing, a cardiac arrest may be initially mistaken for fainting.

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