Hello, i was wondering what could cause really irregular periods. i have an iud but the last few months my periods have been lasting 10-14 days with a week break and then it starts back up again. ultrasound came back normal.

Abnormal bleeding: This type of bleeding is usually due to subtle hormonal abnormalities in the hypothalamic pituitary endocrine axis, the control center for all hormones in the body. If this pattern persists, I would consider switching to an oral contraceptive instead of the IUD for birth control. At some point a uterine ultrasound might be helpful, and with increased heavy bleeding sometimes a D & C is necessary.