The incidence of breast cancer is increasing year by year in China and has become one of the major killers threatening women’s health. In fact, as long as breast cancer is detected and diagnosed early, coupled with standardized and comprehensive treatment, the mortality rate is not high. The detection of breast cancer mainly relies on self-examination and specialist examination. Self-examination is easy to perform and can detect large breast lumps and abnormalities such as nipple overflow and eczema-like changes in the nipples. However, it is easy to miss small breast lumps, so it is recommended that adult women should go to a breast specialist at least once a year. A breast specialist examination includes a standardized physical examination by a breast specialist and related imaging examinations for suspicious findings. Commonly used methods include mammography, ultrasound and magnetic resonance imaging. Mammography is safe, non-invasive and can often detect tumors that cannot be felt, and is particularly sensitive to in situ cancers with microcalcifications as the main manifestation. In addition, it is also valuable for differentiating benign and malignant tumors and identifying their specific locations. Ultrasound and mammography complement each other and can be repeated several times in a short period of time. They are safe, economical, non-invasive and can precisely locate “untouchable” breast lumps. Breast MRI is highly sensitive for occult breast cancer and multiple breast lumps, and can assess whether breast cancer has infiltrated the chest wall to guide treatment.