4 doctors weighed in:
Why do your eyes get red when you cry?
4 doctors weighed in

Dr. Vance Kilmore
Ophthalmology
3 doctors agree
In brief: Red eyes
This is actually a very good question and it would seem like the answer would be simple and straight forward.
The most likely cause is related to a valsalva maneuver. When we cry, we often hold our breath somewhat and this retards the flow of blood into the lungs and increases back pressure on the venous side of our circulation. This causes blood vessels to be engorged, including the eye.

In brief: Red eyes
This is actually a very good question and it would seem like the answer would be simple and straight forward.
The most likely cause is related to a valsalva maneuver. When we cry, we often hold our breath somewhat and this retards the flow of blood into the lungs and increases back pressure on the venous side of our circulation. This causes blood vessels to be engorged, including the eye.
Dr. Vance Kilmore
Dr. Vance Kilmore
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