In recent years, there have been many articles on comparing the age of onset of breast cancer in Chinese women with that in Western women, and it is generally agreed that the age of onset of breast cancer in Chinese women is younger than that in Western women, about ten years younger. This is a question worth exploring, and a brief analysis is made from the biological, psychological and socio-medical model of the disease. In terms of biological factors, breast cancer is an estrogen-dependent tumor. Nowadays, women generally marry late, have few children or even do not marry and have no children, which leads to a high level of estrogen secretion and long-term stimulation of breast gland leading to hyperplasia and other diseases. In addition, food, air and water are also factors to consider. Psychological factors, Eastern women are generally more introverted than Western women, when they encounter unhappiness like to be smothered in the heart. Chinese medicine believes that the liver is the main drainage, emotional discomfort will lead to liver qi stagnation, qi stagnation, phlegm condensation, blood stasis in the breast, wrestling knots do not disperse, the accumulation of months and months and lead to breast disease. Social factors, the author would like to focus on a little more. 30-something women are at the crossroads of various social factors. In terms of career, if you want to get ahead, you have to give more. In terms of family, they need to raise young children and handle the relationship between mother-in-law and daughter-in-law properly. Sexual life, facing the “seven-year itch” test, including the other half to face the temptation of the outside. In addition, many women are worried about the deformation and sagging of their breasts and losing their attractiveness to their significant others, so they do not breastfeed or try to shorten the breastfeeding period after childbirth, which leads to hormonal disorders and breast diseases. Any disease is not simply due to biochemical factors, but must take into account the social and psychological dimensions. The prevention and treatment of breast cancer must also follow this principle. Every member of the family community is not a bystander and can contribute to reduce the incidence of breast cancer.