Depends: Blood rushing in all directions, possibly pooling and insufficient getting to brain. Also, likely dehydrated which would help cause this. Be sure to hydrate while swimming, especially in the AM and PM as most people are dehydrated first thing in the morning and after work at night. (before usual meals). Any meds/supplements (Viagra (sildenafil) ?) which might cause this ? Good Luck.
Answered 4/21/2015
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A doctor has provided 1 answer
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