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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Fainting After Severe Diarrhea?

53 yr. male. Frequent bowel movements during the night for several nights in a row. Sleep interrupted. Last night had severe diarrhea after dinner. Passed out and woke up on bathroom floor by commode. 2nd time in a year I ve passed out after having bm during the night hours. Sound like any specific problem?
Mon, 16 Nov 2015
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General & Family Physician,  's  Response
Hi there.
There are 2 main reasons why you could've fainted following loose stools
1) large volume loose stools cause sudden loss of a large volume of fluid from the body and cause dehydration which causes the fainting due to drop in blood pressure.
2) what is commonly called Reflex syncope - sudden large stools or large quantity of urine causes a drop in Heart rate and blood pressure causing syncope or fainting.
In either case you have to get evaluated as to why you're having such large volume stools.
Start with a stool routine test and consult a physician in person and get a health check up
Hope this helps.
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What Causes Fainting After Severe Diarrhea?

Hi there. There are 2 main reasons why you could ve fainted following loose stools 1) large volume loose stools cause sudden loss of a large volume of fluid from the body and cause dehydration which causes the fainting due to drop in blood pressure. 2) what is commonly called Reflex syncope - sudden large stools or large quantity of urine causes a drop in Heart rate and blood pressure causing syncope or fainting. In either case you have to get evaluated as to why you re having such large volume stools. Start with a stool routine test and consult a physician in person and get a health check up Hope this helps.