In recent years, the incidence of breast cancer in China has shown a rapid increase. What should we do to cope with it? You need to seek medical attention when you find a lump in your breast. But did you know that a healthy woman needs to have a mammogram? We need to have breast screening! I. What is breast screening? Breast cancer screening is an effective, easy and economical way to screen asymptomatic women for early detection, early diagnosis and early treatment. Its ultimate goal is to reduce the mortality rate of breast cancer in the population. The ultimate goal is to reduce the mortality rate of breast cancer in the population, which is often referred to as physical examination. When to start breast screening? Generally, it is recommended to start screening at the age of 40, but for some people with high risk of breast cancer, the starting age of screening can be advanced to 20 years old. For the general population, if you are 20-39 years old, you may not have a physical examination without special circumstances; if you are 40-69 years old, you should have a physical examination once a year; if you are 70 years old or above, you should have a physical examination once every two years. What are the methods of breast cancer screening? 1.Mammography (mammogram): The role of mammography in reducing breast cancer mortality in women over 40 years old has been recognized by most scholars at home and abroad, and mammography screening is highly accurate for Asian women over 40 years old. However, mammography has poor penetration to young dense breast tissue, so mammography is generally not recommended for women under 40 years of age without clear risk factors for breast cancer or abnormalities found on clinical physical examination. Routine mammograms are not harmful to women’s health because of the low dose of radiation, but normal women do not need to undergo repeated mammograms in a short period of time. 2. Clinical breast examination: The effect of clinical breast examination alone as a method of breast cancer screening is not certain, and there is no evidence that this method can improve the early diagnosis rate of breast cancer and reduce the mortality rate. However, it is a supplement to other examinations. 3.Breast self-examination: Breast self-examination cannot improve the detection rate of early diagnosis of breast cancer and reduce the mortality rate. However, for the current situation of medical treatment in China, I recommend monthly self-examination. 4.Breast ultrasound: In China, the proportion of premenopausal patients is high and the breast is relatively dense, so ultrasound can be used as an auxiliary means of breast screening. The sensitivity of mammography is related to the density of breast imaging, and the sensitivity of fatty breast is as high as 98%, while dense breast is only 48%. On the other hand, Chinese women have smaller breasts than in the West, but have dense glandular tissue. With the advancement of ultrasound technology, ultrasound examination is more desirable. However, ultrasound examination is more restricted by the skill level of the operator. 5, breast magnetic resonance (MRI) examination: MRI examination can be used as a supplemental examination measure for suspected cases found by mammography, breast clinical physical examination or breast ultrasound examination. It has been reported that the sensitivity of breast MRI scan in monitoring breast cancer is as high as 94%-100%, and the specificity is 37%-97%, but it is expensive and requires enhancement agents such as intravenous gadopentetreotide, and contraindications include pacemaker and aortic coarctation. How should breast cancer screening be performed in high-risk groups? In addition to clinical examination, ultrasound and mammogram, new imaging methods such as MRI can be applied.