Why am i experiencing waist pain while taking my birth control pills?

A few possibilities : Birth control pills can sometimes cause water retention and bloating which may contribute to your discomfort. If your pain extends to the front of your abdomen and moves around, this could be gas or indigestion. Some patients take their birth control pills with food to avoid this. Finally, there is a small possibility that the discomfort could be a sign of an ovarian cyst.