The incidence of breast cancer is very high, second only to cervical cancer, and is increasing year by year, while the age of onset seems to have a younger trend, so it is felt that more female compatriots should be alert to the fact that these examinations are actually relatively simple, but are still of great significance for the early detection of abnormal breast lesions. The following are the guidelines of the Anti-Cancer Society on breast cancer screening: 1. General women ①Women aged ≥ 40 to < 60 years: 1 mammogram and clinical examination per year. ②Women ≥ 60 to ≤ 69 years old:1 mammogram and clinical physical examination every 1 to 2 years. ③Women under 40 years of age in general:1 breast clinical examination every 1 to 3 years. ④Encourage women to teach self-examination of the breast once a month. ⑤ Recommend combined mammogram and ultrasound examination. 2. High-risk women ①Definition: those with a clear genetic predisposition to breast cancer, BRCA1/2 mutation carriers, and patients with histologically diagnosed atypical hyperplasia and lobular carcinoma in situ of the breast. ②Regardless of age, it is recommended to undergo clinical breast examination every 6-12 months and annual mammography and breast ultrasound under the guidance of a medical professional, and to shorten the interval of mammography screening and increase the number of breast MR I examinations if necessary. It is recommended that women at high risk be taught to self-examine their breasts once a month. Early detection is very important. There are several reasons that affect the early diagnosis of breast cancer. One is the lack of vigilance, believing that there is no discomfort at work, so they do not go to the hospital. There are some people who think they need to check only when they are in pain, but in fact, the real pain is endocrine disorder, and most of the real breast cancer is painless type. There is also the bondage of perception, which of course is less nowadays. There is also the misconception of listening to someone's prejudice and a certain instrument's test, which makes people afraid of getting cancer but not willing to go to the hospital. Another one is that they are too busy to go to the hospital for examination. All of these are undoubtedly the reasons why breast cancer is not diagnosed early. To sum up, if you have a family history of breast cancer, you should go to the hospital for regular checkups. In addition, if you find any abnormalities through breast self-examination, you should go to the hospital for examination in time. In addition, you should actively cooperate with breast cancer screening. Only through multiple ways of examination and prevention of breast cancer can breast cancer be avoided and detected early.