What is this pulsation i grain essential my rectum unevenly?

Sometimes its a sharp pulse, other times it is repetitive. It is random, and this is a serious sound out.

Answer:
Probably a spasm of one of the muscles "down there". I say that because it could be anywhere from the colon to the sphincter or even within your glutes (butt cheek) If U R male it could be your prostate. most promising nothing, but if you are really worried name your dr.
probably hemorrhoids. either that or there's some guy giving you anal.
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