Breast self-examination method 20-39 years old: clinical breast examination once a year and monthly breast self-examination; over 40 years old: mammography every six months, annual clinical breast examination and monthly breast self-examination. Self-examination method Look: face the mirror with both hands down and carefully observe whether the size of both sides of the breast is symmetrical, whether there is any abnormal local protrusion, whether there is local redness, swelling and pain, whether the skin and nipples are sunken or eczema, whether the bilateral nipples are pointing in the same direction and whether they are changed. Touch: Lift the left hand to the back side of the head, check the left breast with the right hand, lightly press the breast with the finger belly to feel if there is a hard lump, start from the nipple to do a circular clockwise check, gradually outward (about three or four circles), until all the breasts are checked, check the right breast in the same way. Lie down: Lie down with a pillow under your right shoulder, bend your right hand under your head and repeat the “touch” method to check both breasts. Twist: twist the nipple with the thumb and index finger, pay attention to the presence of abnormal secretions, pay attention to whether the red bloody liquid. Additional notes: 1, the time of breast self-examination should be in the 3-5 days after the onset of menstruation, shower can also be carried out, because the skin is wet easier to find breast problems. 2.This examination should be adhered to once a month. If you find bilateral breast asymmetry, breast lumps or hard nodes, or hardened texture, breast skin edema, depressions, or eczema-like changes in the areola, you should immediately go to the hospital and ask a specialist for an examination. 3. Breast self-examination cannot reduce the death rate of breast cancer patients, so it is better for women over 20 years old to go to a specialist hospital for a comprehensive physical examination every year, and for women over 40 years old to go to a specialist hospital for a comprehensive physical examination every six months, so that lesions can be detected early and prevented before it happens.