What causes an abnormal menstrual cycle? I am a healthy 33 year old female. I don't smoke, do drugs or drink. I have two children (12 and 10) both normal births. I have only one sexual partner (my husband) who had a vasectomy about 8 years ago. I have had

I . I can understand your concern as that is a very unusual menstrual cycle. Please take a pregnancy test to be sure that isn't the cause, but it sounds unlikely. Please have your thyroid hormones checked to be sure you are not hypothyroid. It is also important to be sure you are receiving adequate nutrition, as patient's with malnutrition can have irregular cycles. That is a very long time to go without a period so i advise that you do see a gynecologist and have this completely evaluated.