Is it normal to have really horrible pains in your butt while on your period?
Your body can cramp in the intestines and muscles around your stomach and butt, which makes your spincter feel as though it is cramping.
Cramps, uterine swelling, and bloating can put pressure on your gluteal muscles—the ones that make up the buttocks. When enough tension builds, the muscles might spasm, causing pain in the lower back, pelvis, and butt.