Hi, The possible causes of hypomenorrhea means decreased flow during periods are: - General causes like anemia, thyroid hormonal imbalance etc. - Changes in diet, sleep, exercise etc, stress and strain, weight changes - Ovarian causes like poly cystic ovarian disease etc. If the hypomenorrhea persists, better to consult your gynecologist once, get examined and go for investigations like complete blood picture, blood sugar levels, thyroid profile, serum prolactin levels and ultrasound. With this work-up the possible cause of your problem can be identified and treatment can be taken accordingly. Taking a balanced, healthy diet, regular calorie burning exercises and maintaining a normal body mass index helps in regularizing the menstrual cycles. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Sree Gouri S. R., OBGYN