Hi Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern... Uterine fibroids can cause increased menstrual flow or heavy & prolonged menstrual periods. They are very common in females of middle reproductive age. However in most of cases they are painless & are less common to cause infertility in woman. Heavy periods could also occur in females with no fibroids or other uterine problems. Systemic causes such as thyroid disease, excessive emotional/physical stress can also cause such problem Endometriosis could be the reason of abnormal heavy & painful menstruation. They are extension of the endometrial tissue outside of the uterus tries to shed causing painful and abnormal bleeds. However extension of the endometrial tissue into the wall of the uterus is also present in some cases. Endometriosis commonly causes infertility. They are both diagnosed by ultrasound imaging of uterus & pelvic organs. Therefore undergo a complete checkup & ultrasound by consulting a gynaecologist. Refer to a gynaecologist Hope this information helps