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A 29-year-old member asked:

what is the difference between falling asleep and passing out?

1 doctor answer2 doctors weighed in
Dr. Randy Sussmane Stubbs
Sleep Medicine 35 years experience
Syncope is not sleep: Passing out or syncope is an abnormal loss of consciousness that often times cannot be predicted. Sleep is a normal and required physiologic function of the human body. If you are having syncopal events then you need to be seen by your physician.

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Similar questions

A 47-year-old member asked:

Can being in a hot tub cause passing out and seizures?

2 doctor answers3 doctors weighed in
Dr. Craig Armstrong
Pediatrics 44 years experience
Yes: A hot tub can result in blood vessels in the extremites to dilate and cause decrease circulation to the brain. This can certainly cause fainting. Many who faint will have seizure-like activity from lack of oxygen to the brain, but it is not the same as epilepsy. No one should be alone in a hot tube because of these safety concerns.
A 46-year-old member asked:

I passed out after bending down to retrive my drink from the vending machine. Why would it happen?

1 doctor answer2 doctors weighed in
Dr. Maureen Mays
Specializes in Clinical Lipidology
Postural hypotension: Postural hypotension may be caused by dehydration or something more serious. You need to see a doctor so that he/she can look at this in the context of your overall health. For example, if you treat it as dehydration and drink a lot of water, that would be bad if you have underlying heart failure. So see your doctor and get a plan.
A 35-year-old member asked:

How long can a person hold their breath for before passing out?

1 doctor answer2 doctors weighed in
Dr. James Isobe
Phlebology 54 years experience
Variable: Breath holding spells usually come on after stress, pain, and there are several categories of these spells. The record for breath holding is 22 min, 22 secs, and this person did not pass out. Try it out with someone timing you.
A 26-year-old female asked:

I passed out about 2min or so what is this from?

2 doctor answers2 doctors weighed in
Dr. Geoffrey Rutledge
Internal Medicine 41 years experience
Evaluation needed: Passing out can be a serious and even life threatening sign, or it can be from a variety of less critical causes. A thorough medical and family history, possibly also with some tests may be indicated.
A 35-year-old member asked:

Can any doc tell me what's the difference between falling asleep and passing out?

1 doctor answer1 doctor weighed in
Dr. Charles Coleman
Sleep Medicine 42 years experience
See below.: Sleep is a normal physiologic state of the brain. "Passing out" is the colloquial term for what is medically known as "syncope" which occurs if, for whatever reason, the brain temporarily does not receive enough blood or oxygen.

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Last updated Jun 20, 2017

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