There are some conditions that the pill helps regulate, or at least lessen the symptoms of fairly well. PCOS being one of them, which it is estimates thatapprox. 10% of women have. Among other things PCOS can cause absent or very irregularly menstruation, which in turn can cause uterine cancer.
There are many natural treatments for that condition, and I would recommend that young women look into them before subjecting themselves to potentially life-threatening medications.