Hi there...it may occur in women who have anemia i.e low haemoglobin levels,diabetes or thyroid problems. It is also common in women with high levels of a protein called prolactin in their blood...it can be the side effects of certain drugs like oral contraceptives,antipsychotics,antiepileptics...it may be due to poly cystic ovarian disease as well... So I would suggest you to consult nearest gynecologists for detailed clinical examination and evaluation they will do the needful.

Hello, Are you anemic? If yes then get your blood levels checked. Have you gained a lot of weight? If yes then irregular periods and sudden weight gain is a common symptom of PCOD. Hence, consult a gynecologist and get yourself evaluated for PCOD and seek proper treatment.