If it continues for 3 mths see gyn

This is a common problem. Menstrual problems like the one described is usually diagnosed as dysfunctional uterine bleeding and the cause is usually anovulaton. To be brief, the timing mechanism for regular timely periods is ovulation. If there is no or irregular ovulation, the periods are irregular, light, or sometimes very heavy. Anovulation has various causes and the patient would need an exam and laboratory work up in order to find a cause. Anovulation, if left untreated for months to years, can be dangerous as it can stimulate abnormal cell growth in the uterus and this could lead to precancerous or cancerous changes.