Other menstrual-type cramps can be caused by conditions of the reproductive tract, such as the following:
- Endometriosis -- uterine tissue that appears outside the uterus
- Fibroids and adenomyosis -- noncancerous (benign) growths in the uterus
- Infections in the reproductive organs
- Abnormal pregnancy, such as an ectopic pregnancy (pregnancy in the tubes, outside the uterus)
- IUD (intra-uterine device) used for birth control
- Ovarian cyst
- Narrow cervix