A lady friend has been having her periods every two weeks heavy heavy flows. she is worried. what can be the case?

Should be checked: It could be many things. The worst are cervical or uterine cancer. It maybe from an abnormal thyroid gland messing up the hormones. It could be from a benign type of growth inside the uterus called a fibroid. It could just be from stress making the hormone levels rise and fall. Bottom line is, you need to make sure it isn't anything serious, so see your doctor about it soon.