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Depending on the cause of your fainting spell, you may have some or all of these symptoms before or during the episode:
Find out more about fainting:
Diagnosis and Treatment
You have an unexplained fainting episode. Especially if the episode occurs during exercise, happens during heart palpitations (feeling the heart beat irregularly), or if you have a family history of recurrent fainting or sudden death.
WebMD Medical Reference
Heart Rhythm Society.
American Academy of Family Physicians.
The Merck Manual.
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