Family history of hereditary breast cancer can be in two forms: one is that the mother has breast cancer and the daughter also has breast cancer, the age of onset is young, often occurs before menopause, and is mostly bilateral; the other is that the mother has not had breast cancer, but in a family, at least two sisters have breast cancer, the incidence of breast cancer in such families is 2 to 3 times higher than that in families without family history. The incidence of breast cancer in such families is two to three times higher than that in families without family history. 2. Menstrual factors: The risk of breast cancer is 2.2 times greater if the age of menarche is earlier than 12 years old than if the age of menarche is 17 years old; the risk of breast cancer is 1 times greater if the age of menopause is later than 50 years old than if the age of menopause is 45 years old. Too many abortions: Normal natural abortion does not increase the risk of breast cancer, but repeated abortions or multiple abortions before the age of 18 can easily lead to breast diseases and increase the risk of breast cancer. Breastfeeding is one of the best natural means to prevent breast cancer, and breastfeeding can reduce the risk of breast cancer by 20% to 30%. 5. Poor quality of sex life: Breast diseases and sex life are closely related, and women’s sexual repression can increase the incidence of lobular hyperplasia and breast tumors. Domestic survey shows that 86% of women with lobular hyperplasia have never reached orgasm during sex; the older the age of first marriage, the higher the incidence of breast cancer. 6. Depression: Among single women, ladies left behind, PR girls, retired female workers and some secondary school teachers, more suffer from breast diseases and the incidence of breast cancer is also high. As these women are prone to depression, such as tension and anxiety, loneliness and depression, sadness and sorrow, bitterness and disappointment, impatience and irritation, the body’s life rhythm will be disturbed and the neuroendocrine system will be dysfunctional, which will lead to the imbalance of the internal environment and the decrease of immunity, so that the thymus gland will produce and release less thymosin, and the lymphocytes and macrophages will be less able to monitor and phagocytose mutated cells in the body. The ability of lymphocytes and macrophages to monitor and phagocytosis of mutated cells in the body is reduced and cancer is likely to occur. 7. Excessive obesity: obesity is closely related to breast cancer. Girls who are obese are prone to early sexual maturity, which will lay the foundation for breast cancer in the future. The incidence of breast cancer in obese people is 3.45 times higher than that of non-obese people because of the excessive accumulation of fat, the production of estrogen increases, and the excess estrogen is lipidated and stored in the adipose tissue, and constantly released into the bloodstream, which stimulates the breast tissue and, over time, easily causes breast cancer. In addition, most obese people have hypercholesterolemia and hyperinsulinemia, after the body cholesterol is elevated, lymphocytes, macrophages and other cell membrane cholesterol content is elevated, inhibiting the immune function. 8, dabbling in bad habits: to smoke, alcohol as “fashionable”, to nightclubs, dance halls, all-nighters, immersed in the lights, like to eat fried food and a variety of sweets and pastries, but never to rough food, vegetables; celibacy, or after 30 years of age before marriage and childbirth, the child does not want to breastfeed; also some women wear bras too tight or Some women wear bras too tight or too loose, losing the role of breast protection.