The causes of breast pain are as follows: 1. Breast enlargement: It is a common female disease, and the symptoms are usually heavier during the holidays, and can gradually decrease after the holidays. 2. There are swellings in the breast: they may be benign swellings, such as fibroids, or malignant swellings, such as breast cancer, which require further examination, such as breast ultrasound, mammogram, breast MRI, etc. If hyperplastic tissue is found, puncture biopsy or excision biopsy may be required to clarify the nature.