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1.

Syncope

Fainting is a temporary loss of consciousness. If you're about to faint, you'll feel dizzy, lightheaded, or nauseous. Your field of vision may white out or black out. Your skin may be cold and clammy. You lose muscle control at the same time, and may fall down. Fainting usually happens when your blood pressure drops suddenly, causing a decrease in blood flow to your brain. It is more common in older people. Some causes of fainting include. -Heat or dehydration . -Emotional distress . -Standing up too quickly . -Certain medicines . -Drop in blood sugar . -Heart problems . When someone faints, make sure that the airway is clear and check for breathing. The person should stay lying down for 10-15 minutes. Most people recover completely. Fainting is usually nothing to worry about, but it can sometimes be a sign of a serious problem. If you faint, it's important to see your health care provider and find out why it happened. .  [from MedlinePlus]

MedGen UID:
21443
Concept ID:
C0039070
Sign or Symptom
2.

Vasovagal syncope

Loss of consciousness due to a reduction in blood pressure that is associated with an increase in vagal tone and peripheral vasodilation. [from MeSH]

MedGen UID:
12060
Concept ID:
C0042420
Disease or Syndrome

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