What is the reason for pulsating buttocks?
Hi! It can happen due to several different things, including lots of exercises, sitting too many hours, or even standing up for extended periods of time.
If you are also undergoing lots of stress, your muscles can Twitch (happens a lot to me). You might also be tense, and that can happen due to that.
Now if it is just too much for you to bear you can go see a doctor since he will be able to help you better understand the issue and help you get rid of the discomfort.