Question: what are the abnormalities of menstruation?
Answer: Abnormal uterine bleeding. Excessive or prolonged menstrual bleeding.
Amenorrhea. The absence of menstrual bleeding.
Oligomenorrhea. Light or infrequent menstruation.
Fibroids. Noncancerous uterine tumors.
Premenstrual syndrome (PMS). ... 
Premenstrual dysphonic disorder (PMDD).