Naturally occurring estrogen and progesterone stimulate the development and growth of some cancers (e.g., cancers that express receptors for these hormones, such as breast cancer). Because birth control pills contain synthetic versions of these female hormones, they could potentially also increase cancer risk. Those currently taking the combined pill have a slightly increased risk of breast cancer. Taking the combined pill for only a short time may not have any effect on risk of cervical cancer. But, those who have been using it for 5 years or more have an increased risk of getting cervical cancer than those who have never used the combined pill.
The combined pill contains oestrogen and progestogen. The link between the pill and breast cancer risk is not yet clear, but these hormones can increase the growth of some breast cancers, which might explain why taking the pill slightly increases the risk of breast cancer. Should I take the pill if I have a family history of breast cancer? Jul 27, · Since the early s, birth control pills have become the most popular and one of the most effective forms of birth control used in the U.S. But an association between estrogen and an increased.