Regular screening is an effective way to prevent and detect breast cancer at an early stage. Especially for women over 40 years old, even if they do not have abnormal conditions such as breast pain, it is better to have a breast examination once a year so that any problems can be dealt with immediately without delaying the disease and can also reduce the mortality rate of breast cancer. More than 90% of cancers are painless in the early stage, and many people do not go to the hospital as a last resort because of their busy schedule and fear of trouble. This “last resort” is usually a painful attack. Some patients have had lumps on their breasts for a long time, but they don’t come to the doctor because they don’t hurt. However, when they come back for examination after pain or even skin changes, the breast cancer may have already reached the middle or late stage. ”People think that breast pain is a sign of cancer, but in fact, the more painful the breast is instead of necessarily having a cancer problem, it may be a simple breast hyperplasia.” More than 90% of cancers are painless in the early stage and their occurrence is often unknown, so it is good to see a doctor for breast pain, but it is more meaningful to take the initiative to come to the hospital for screening when there are no symptoms and no pain at all. It is reported that 8% of the patients with breast cancer in situ in the hospital are found when they come to the hospital actively (without any abnormality), and their age is concentrated around 40 years old, with the peak incidence between 45-55 years old. Therefore, for women over 40 years old, experts believe that they should be more vigilant and have regular checkups. There are four major manifestations that need to be examined in detail Nowadays, many units do routine physical examinations every year, involving ultrasound examinations of the breast, and the words “breast hyperplasia”, “cyst”, “nodule” often appear on the report. The report often shows words such as “breast enlargement”, “cyst”, “nodule” and so on, suggesting that the examinee be further examined. But some women think it’s no big deal and that it’s okay not to get checked. As soon as the four major presenting symptoms appear, you should ask a specialist for a detailed examination. Although there is not necessarily a possibility of malignant change, it is always good to be alert and feel relieved to rule out breast cancer yourself. According to the report, there are four major manifestations of breast tumor: 1) lumps and masses, including solid lumps, cysts, nodules, etc.; 2) asymmetric glandular restriction thickening; 3) nipple overflow, which has a 9% chance of occurrence of breast cancer in situ; 4) areola and skin changes, such as nipple eczema, which may be a manifestation of early breast cancer. Breast examination methods differ according to age Mammography (X-ray) is the most commonly used standard test for screening and diagnosis of breast cancer, which is characterized by the detection of breast lumps or calcified foci that cannot be touched by doctors. It is especially sensitive to detect early stage cancer or microscopic cancer in the elderly breast with more fatty tissue or atrophied glandular tissue. However, it is less sensitive for dense breast or small breast. Since 60-70% of Chinese breast cancer patients occur under the age of 50, considering the characteristic of “youthfulness”, mammography (X-ray) and ultrasound are currently advocated in China for screening mammography in women aged 40-50. High-risk groups can also opt for breast MRI first. It is better for women over 50 years old to have mammogram (mammography) first, and for women aged 40-50 years old, only mammogram is not enough, but also with ultrasound, while asymptomatic women under 40 years old in principle do not have mammogram routinely, and if it is a personal requirement, ultrasound should be preferred. It is reported that younger women suffer more from fibroadenomas, lobular tumors, cysts and adenopathy than breast cancer. For these benign breast diseases, ultrasound not only shows them more clearly than mammogram, but also identifies most of them as benign and malignant. If mammography and ultrasonography are not definitive, breast MRI or other tests, including minimally invasive biopsy or ductoscopy for nipple discharge, may be chosen.