5 doctors weighed in:

Can you get brain damage from lack of oxygen fainting?

5 doctors weighed in
Dr. Barton Cook
Pediatrics - Cardiology
2 doctors agree

In brief: Generally no

A simple faint restores adequate blood flow to the brain as you become horizontal, and recovery is forthcoming.
If you have brain damage from a faint it can be from a near- fatal arrhythmia (such as from long qt syndrome or hypertrophic cardiomyopathy.), or prolonged seizure. A physician can help determine if there is cause for concern.

In brief: Generally no

A simple faint restores adequate blood flow to the brain as you become horizontal, and recovery is forthcoming.
If you have brain damage from a faint it can be from a near- fatal arrhythmia (such as from long qt syndrome or hypertrophic cardiomyopathy.), or prolonged seizure. A physician can help determine if there is cause for concern.
Dr. Barton Cook
Dr. Barton Cook
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1 comment
Dr. James Eitner
However, if the blood flow is slowed or stopped due to being choked or neck compression, fainting or blacking out will not restore the blood flow and oxygen until the compression or choke hold is relieved.
Dr. Edward Smith
Neurology
1 doctor agrees

In brief: Yes

The human brain can withstand at most 4 minutes of oxygen deprivation before experiencing brain damage.
Damage may be irreversible at this time but the brainstem is more resistant, hence the occurrence of "persistent vegetative state". But a simple faint can result from only a few seconds of oxygen deprivation without causing long-term damage.

In brief: Yes

The human brain can withstand at most 4 minutes of oxygen deprivation before experiencing brain damage.
Damage may be irreversible at this time but the brainstem is more resistant, hence the occurrence of "persistent vegetative state". But a simple faint can result from only a few seconds of oxygen deprivation without causing long-term damage.
Dr. Edward Smith
Dr. Edward Smith
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