###Human: My teenage sister does not have a period from almost a year. Why? ###Assistant: Hello. Your sister could be having polycystic ovarian syndrome (PCOS). It is a metabolic problem which is quite common these days. This is not a disease per se related to the ovaries but, to the whole metabolism of the body. This usually manifests as irregular cycles, excess hair growth (male pattern), obesity, etc. and there is a future risk of developing diabetes and hypertension. I would advise your sister to consider regular exercises and weight reduction as her BMI (body mass index) is in the overweight range. The medications she has been prescribed are alright. Ladies with PCOS usually have difficulty in conception but, it is possible if they regulate their cycles and their body with regular exercise and diet modifications. Do not worry about future conception. She will definitely be able to concieve, provided she regularly follows up with the advice of her gynecologist. Assure her and all the best. For more information consult an obstetrician and gynaecologist online -->