2006-12-18 09:21:24 · 6 answers · asked by Anonymous in Health ➔ Diet & Fitness
Fainting is a temporary loss of consciousness due to a drop in blood flow to the brain. The episode is brief (lasting less than a couple of minutes) and is followed by rapid and complete recovery. You may feel lightheaded or dizzy before fainting.
A longer, deeper state of unconsciousness is often called a coma.
Considerations Return to top
When you faint, you not only experience loss of consciousness, but also loss of muscle tone and paling of color in your face. You may also feel weak or nauseated just prior to fainting, and you may have the sense that surrounding noises are fading into the background.
Common Causes Return to top
Fainting may occur while you are urinating, having a bowel movement (especially if straining), coughing strenuously, or when you have been standing in one place too long. Fainting can also be related to fear, severe pain, or emotional distress.
A sudden drop in blood pressure can cause you to faint. This may happen if you are bleeding or severely dehydrated. It can also happen if you stand up very suddenly from a lying position.
Certain medications may lead to fainting by causing a drop in your blood pressure or for another reason. Common drugs that contribute to fainting include those used for anxiety, high blood pressure, nasal congestion, and allergies.
Other reasons you may faint include hyperventilation, use of alcohol or drugs, or low blood sugar.
Less common but more serious reasons include heart disease (like abnormal heart rhythm or heart attack) and stroke.
http://www.nlm.nih.gov/medlineplus/ency/article/003092.htm
2006-12-18 10:18:23 · answer #1 · answered by Sancira 7 · 0⤊ 0⤋
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2016-05-23 05:13:08 · answer #2 · answered by Anonymous · 0⤊ 0⤋
my friend can make herself faint by holding her breath. so i'm guessing it's no oxygen or lack of oxygen to the brain.
2006-12-18 09:30:03 · answer #3 · answered by Anonymous · 1⤊ 0⤋
a lack of oxygenated blood to the brain.
2006-12-18 09:32:40 · answer #4 · answered by tecsklls9 3 · 0⤊ 0⤋
the main reason is insufficient oxygen supply in the brain
2006-12-18 09:25:35 · answer #5 · answered by deeta 3 · 1⤊ 0⤋
LOW BLOOD PRESSURE, A SHOCK. AN ACCIDENT.
2006-12-18 09:23:00 · answer #6 · answered by Anonymous · 0⤊ 0⤋