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, Irregular periods is caused by hormonal imbalance (like prolactin, oestrogen, progesterone,) hypothyroidism, reproductive tract infections, PCOS, anemia,fibroids, stress etc, some of the causes in this also increases weight like hypothyroidism and PCOS, you need to be treated for that to lose weight too please consult a gynecologist. And daily consistent workout in gym (more of cardio), and also LIMITING CALORIES (most important), is necessary to lose weight.