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Painful menses (dysmenorrhoeas) and excessive bleeding (menorrhagia) can be due to many reasons. A detailed history including past medical history, your obstetric history, how and when did your complaits start, wheather you are taking any medcation, contraceptive use etc are required here.
Common reasons for painful & excessive menses are - uterine fibroid
, an intrauterine device
, use of contraceptive pills, hyperthyroidism