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What conditions can cause fainting?

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Many different conditions can cause fainting. These include heart problems such as irregular heart beats, seizures, low blood sugar (hypoglycemia), anemia (a deficiency in healthy oxygen carrying cells), and problems with how the nervous system (the body's system of nerves) regulates blood pressure. Some types of fainting seem to run in families.

SOURCES: 

Heart Rhythm Society. 

American Academy of Family Physicians. 

The Merck Manual.

Reviewed by Carol DerSarkissian on April 2, 2017

SOURCES: 

Heart Rhythm Society. 

American Academy of Family Physicians. 

The Merck Manual.

Reviewed by Carol DerSarkissian on April 2, 2017

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What does fainting mean?

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