Why do you sometimes shiver when you wee?

In any case, at the moment of urination, there is a slight blood pressure rise and a momentary flushing or euphoria shortly after relaxing the urethral sphincter. Some find this feeling pleasurable. At such moments, some people say “ah”. This same response in its most extreme forms causes fainting. All of this is the ANS doing its job.

Well, those are the symptoms. For the why, read this.

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