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Health Tip: Things That May Trigger Fainting

When there's a drop in blood flow to the brain

(HealthDay News) -- Fainting describes a brief loss of consciousness due to a drop in blood flow to the brain.

The U.S. National Library of Medicine says the following triggers may cause fainting:

  • The sudden onset of extreme distress or fear.
  • Being in severe pain.
  • Straining to have a bowel movement.
  • Standing up for a long period.
  • Excessive and forceful coughing.
  • A rapid drop in blood pressure, which can be triggered by factors including dehydration, some medications, bleeding or standing up too quickly.
  • Abusing drugs or alcohol.
  • Having low blood sugar.
  • Having a stroke or heart attack.
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