Early detection of breast cancer and rationalized treatment can reduce its mortality rate and improve the quality of life. Vigorously popularizing the knowledge of early detection of breast cancer and widely carrying out breast cancer screening can improve the survival rate and reduce the mortality rate of breast cancer. Pathogenic factors of breast cancer: The development of breast cancer is related to heredity, environmental factors and life style. Several major factors are known to induce breast cancer: (1) Age: In women, the incidence rate rises with age, after the age of 20, the incidence rate rises, and the rate is higher at the age of 45-50, but it is relatively stable, and the incidence rate continues to rise after the menopause, and it reaches the highest peak at the age of about 70. The mortality rate also rises with age, and it gradually increases after the age of 25, and remains on an upward trend until old age. (2) Hereditary factors: women with a history of breast cancer in their first-degree immediate family have a risk of breast cancer that is two to three times higher than that of the normal population. (3) Other breast diseases: Some benign tumors or atypical breast hyperplasia, without reasonable treatment, may be transformed into breast cancer. (4) Age of first menstruation: the risk of developing breast cancer is 2.2 times higher if the age of first menstruation is earlier than 13 years old than that of those who are older than 17 years old. (5) Age at menopause: the risk is increased for those whose age at menopause is greater than 55 years than for those younger than 45 years. (6) Age at first pregnancy: the risk increases gradually with the age at first birth, and the risk is higher in those with a first birth after 35 years of age than in those without a history of childbearing. (7) Postmenopausal estrogen supplementation: Long-term use of estrogen during menopause may increase the risk of breast cancer. (8) Oral contraceptive pills. (9) Food: A high-fat diet, especially, can increase the risk of breast cancer. (10) Alcohol consumption. (11) Weight gain may be an important risk factor for breast cancer in postmenopausal women. Early detection of breast cancer: Any abnormality in the breast: nipple overflow, especially bloody overflow; limited thickening of the breast glands; nipple erosion that is not effective after repeated local treatments; limited pain in the breast; unexplained edema of the areola skin, retraction of the nipple, and limited indentation of the breast skin, etc., the causes need to be carefully identified. If a painless lump is detected during self-examination, you must go to the hospital for timely medical treatment. An experienced breast doctor will palpate the lump, look at its size, location, hardness and boundary, and determine whether it is a malignant tumor, and carry out the corresponding color ultrasound, molybdenum target and other further examinations, breast ultrasound is helpful in the diagnosis of benign and malignant breast, and in the event of breast cancer, a low or high echogenic node will be detected in the color ultrasound. In case of breast cancer, hyperechoic or hyperechoic nodules can be found on color ultrasound, which have unclear boundaries and irregular shape, and early breast cancer may also have small blood flow signals. Early breast cancer may also have small blood flow signals. Breast cancer foci can be clearly visualized on mammograms, and the mass is usually radiated, with burr marks and calcification. In addition, breast cancer can be detected early by MRI, ductoscopy, breast cytology and pathology, and tumor markers. Treatment of Breast Cancer: We now adopt comprehensive treatment for breast cancer, which is divided into two parts, local treatment and systemic treatment. Local treatment includes surgery, radiotherapy, supplemented by systemic chemotherapy, endocrine therapy or targeted therapy after surgery. In the past, once breast cancer was detected, the whole breast was removed. Nowadays, since we have found many early breast cancers in the census, it is not necessary to remove the whole breast, and breast-conserving surgery (localized extended excision) can be performed, which not only preserves the life of the breast cancer patient, but also preserves the breast of the breast cancer patient. If breast-conserving surgery is not available, modified radical treatment of breast cancer with autologous tissue or prosthesis reconstruction with preservation of the nipple areola or breast skin can be performed to maintain the shape of the breast and improve the quality of life of breast cancer patients.