Sometimes when the egg bursts out of the ovary during ovulation this can cause cramp like feelingings, usually just on one side.Painful periods, or dysmenorrhea (say: dis-men-oh-ree-ah), are not usually serious. However, sometimes painful periods can be caused by an infection or by ovarian cysts (fluid-filled sacs in the ovary). Pain also can be caused by endometriosis (say: en-doe-me-tree-oh-sis). This is a problem with the lining of the uterus.If you are concerned I would recommend a visit to your OB/GYN Doctor.
Dysmenorrhea means painful menstruation.