The growth and development of the breast is influenced by estrogen and progesterone, and the pill is a combination of estrogen and progesterone, so when taking the pill there will be a local enlargement of the breast, and this phenomenon will be relieved after stopping the pill. Before taking the pill, it is recommended to do the corresponding examination, mainly to exclude the possibility of breast hyperplasia, if there is hyperplasia, it is not recommended to take the pill for contraception or for the treatment of other diseases, you can use other methods of contraception or other drugs for the corresponding treatment. Do not be nervous if you experience breast enlargement while taking the pill, but you should also pay attention to whether there are local hard nodes by touching them with your hands, and if there are hard nodes, go to the hospital for examination in time.