Breast cancer is one of the most common malignant tumors in women, and studies have proven that obese people can increase their chances of developing breast cancer. The etiology of breast cancer is still not very clear, and it is generally related to early age of menarche, late age of menopause, infertility, and high age of first birth. Research has proved that over-nutrition, obesity and long-term high-fat diet can strengthen the stimulation of estrogen on breast epithelial cells and increase the incidence of breast cancer, so it is right to say that obese people can increase the chance of breast cancer. Of course, breast cancer is also related to environmental factors and lifestyle. Breast Cancer Breast cancer accounts for 7% to 10% of all malignant tumors in our country, and is on the rise year by year. You should pay attention to low-fat diet, exercise, maintain a reasonable body weight, breastfeed as much as possible after delivery, avoid multiple abortions, etc. to reduce the incidence of breast cancer.