Health Nest will provide all authentic information about menorrhagiabr Today we will discuss all about heavy periods or clottingbr br Causes of heavy periods?br br conditions affecting your womb, ovaries or hormones, such as polycystic ovary syndrome, fibroids, endometriosis and pelvic inflammatory disease. some medicines and treatments, including some anticoagulant medicines and chemotherapy medicines. stress and depression.br br What is the most common cause of heavy menstrual bleeding?br br br Hormone imbalance.br br If a hormone imbalance occurs, the endometrium develops in excess and eventually sheds by way of heavy menstrual bleeding. A number of conditions can cause hormone imbalances, including polycystic ovary syndrome (PCOS), obesity, insulin resistance and thyroid problems.