1, self-examination of the breast: first of all, look: to see the degree of bilateral breast symmetry, nipple position with or without invagination, skin with or without depression; you can check by sticking your hands in the mirror or lifting your hands up over your head. Touch: You can lie on the bed and gradually touch your own breast in a clockwise direction. You can also do this in the shower. Touch the texture of the breast, whether there is a lump, whether there is symmetry on both sides, whether there is overflow from the nipple, and whether there are enlarged lymph nodes in the armpit. Many breast diseases are discovered by the patients themselves. 2, routine instrumentation: including mammography ultrasound, mammography + mammogram, breast MRI. The most commonly used are mammography and mammography. There is no such thing as who is better than who. People think that mammograms are more accurate, but this is actually a misconception. Both have their own strengths and both need to be examined. Mammography is usually better for breast calcification, abnormalities in the structure of breast tissue and some malignant diseases. However, mammography is not recommended for patients with dense, thick breast tissue or for patients with severe pain or small breasts; mammography is more accurate for finding small breast nodules, but is not sensitive to fine grain-like calcifications. Therefore, ultrasound is usually recommended once every 3-6 months and mammogram once a year. Breast MRI is more expensive, so it is only recommended for patients who can afford it. Breast ductography is only indicated for patients with overflowing nipples. 3. Special breast examination: including fine needle aspiration biopsy and excisional biopsy. It is used to determine the nature of the lump.