Many women with bleeding disorders have pain during their menstrual period. This is called dysmenorrhea. They can also have pain at mid-cycle of their period, the moment of ovulation, if bleeding is heavy. The cause of this pain is not known. It could be caused by the volume of blood and poorly formed clots in the uterus.
Some women can have a separate condition called endometriosis.
With this condition endometrial tissue forms outside the uterus, for example, around the abdomen. If these women also have a bleeding disorder, the bleeding may be heavy. The blood can irritate the abdominal wall, causing pain.