FAINTING – DESCRIPTION (CAUSES)

May 15th, 2009

Fainting usually occurs in the standing or sitting position. It is rare when a person is lying down.

Fainting is a common occurrence at restaurants, especially if they are hot and stuffy.

A few alcoholic drinks cause dilatation of the skin and a diversion of blood to the gut. Suddenly decompensation takes place and there is an inadequate blood flow back to the heart, and the person may faint.

However, sometimes the fainting episode is due to some pathological cause. That is, there is some underlying disease process.

Sudden loss of blood, such as may occur from a severed artery in an accident or from a miscarriage, or even with a heavy period or a severe nosebleed may lead to fainting.

Bleeding may occur from a duodenal ulcer and the rapid loss of one or two pints of blood may lead to fainting.

If the blood is not vomited (haematemesis) the cause may not be obvious.

However, the blood may pass through the gut and the motion then passed is black and tarry (melaena).

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