4. Endometriosis
Endometriosis is a very painful condition that only occurs in women. Basically, tissue that belongs within the uterus grows outside. The tissue responds to hormones and breaks apart and bleeds during your period. The blood has nowhere to go and causes inflammation, scar tissue and lesions. Not all women experience pain, but those who do often have excessive pain.
If you have pain during sex or urination, painful menstrual cramps or bowel movements, and abdominal or back pain, talk to your OB-Gyn.