Generally accepted medical risk factors for breast cancer include genetic factors, hormonal changes in the body, psychosocial factors brought about by an overly stressful life, and a history of previous breast disease. They are summarized as follows: 1. Women with breast cancer in their family (e.g. mother, sister): If the breast cancer patient in the family is a distant relative (cousin or great-grandmother), the chance of developing the disease will be slightly higher than the average risk factor. If a close relative (mother, sister, daughter, or even father, son, or brother) has breast cancer, the chance of developing the disease is two times higher than the average person; if the immediate family member was diagnosed with breast cancer before the age of 50, the risk of developing the disease later is even greater; and if two or more close relatives have a history of breast cancer, the chance of developing the disease is more than three times higher than the average person. In addition, women with a family history of ovarian, uterine and breast cancer are generally more likely to develop the disease than other women from healthy families. 2.Menarche earlier than 12 years old or age of menopause older than 55 years old. 3.Never had children or had children late (after 35 years old). 4. Decreased duration of breastfeeding after childbirth or artificial breastfeeding. Other risk factors include breast masses (abnormal early breast biopsy); such as heterogeneous hyperplasia (lobular or ductal), fibroadenoma with complex features, atypical hyperplasia, sclerosing adenopathy; prolonged application of estrogen: such as oral contraceptives, postmenopausal use of hormone replacement therapy; and poor lifestyle habits: such as smoking, alcohol abuse, overweight.