3 doctors weighed in:

How come you always get really bad belly aches on your period?

3 doctors weighed in
Dr. Francine Yep
Family Medicine
2 doctors agree

In brief: Chemical Crampers

Prostaglandins are chemicals that make your uterus contract.
These contractions [muscle squeezing] can cause pain. Ibuprofen or other nonsteroidal anti-inflammatory drugs can help. If your periods have always hurt, then talk with your doc about possible endometriosis, another cause of very bad belly pain. There are ways to make periods less painful for you.

In brief: Chemical Crampers

Prostaglandins are chemicals that make your uterus contract.
These contractions [muscle squeezing] can cause pain. Ibuprofen or other nonsteroidal anti-inflammatory drugs can help. If your periods have always hurt, then talk with your doc about possible endometriosis, another cause of very bad belly pain. There are ways to make periods less painful for you.
Dr. Francine Yep
Dr. Francine Yep
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