Few oriental women have the habit of self-examining their breasts, and touching their bosoms seems to be an embarrassing and shameful thing to do. But in fact, breast self-examination – careful observation in front of a mirror and then gentle touching of one’s breasts – is the only way to safeguard breast health, so observing one’s breasts in front of a mirror and doing a breast touch at least once a month is something that every woman needs to do in her lifetime, especially women over 30 years old. I. Checking time: The 9th to 11th day after the menstrual period, preferably in the shower (because wet skin is easier to find breast problems). Women who are new to breast self-examination can do it at several different times during the month so that you will know how hard your breasts are and how the skin texture will change. Second, the examination method: 1, look in the mirror: first of all, arms naturally down, carefully observe the appearance of each side of the breast, the size, surface skin and nipple color changes, whether there is eczema, bumpy breast skin, whether the two nipples are the same height, whether there is fluid (or blood) out of the nipple; then lift one arm to see if the breast is raised as normal with it; third, hands above the head, observe the side of the breast. Fourth, hands smoothly on the hips, press hard to feel the muscles of the chest tense up to see if the breasts have different lines (abnormal protrusion); finally, lean forward with the upper body to see if there are any convex marks, wrinkles, changes in the contours of the breast skin or nipple retraction. 2, touch the breast: place your right arm on the occiput (back of the head) and use the fingers of your left middle and index fingers to check the right side of the breast for lumps, touching with a little pressure and paying attention to touching the breast in one direction. If your breasts are too large, place a pillow under your left shoulder. Similarly check the left breast. Finally, gently squeeze the nipple and again look for any fluid flow. If there are abnormal changes, such as: bilateral breast asymmetry, lumps, hard nodes, or hard texture, breast skin edema, indentation, eczema-like changes in the areola, nipple overflow, etc., please do not be nervous or shy, consulting an oncologist will be helpful to you. These people should do breast self-examination: (1) their mother, sister or daughter had breast cancer; (2) the age of menarche is less than 12 and the age of menopause is later than 55; (3) the age of first birth is older than 30, not pregnant at the age of 40 or older, celibacy, late marriage, short duration of marriage; (4) have had breast cancer on one side; (5) have benign breast diseases, such as lobular or ductal hyperplasia; (6) (6) Obesity, especially postmenopausal significant obesity or diabetes; (7) Women aged 40 to 60 years; (8) Women with frequent exposure to radioactive substances. Please note: Breast self-examination is not a substitute for medical check-ups, and routine breast check-ups should begin at the age of 30. For the general population aged 30 to 49, once every 1 to 2 years; for women aged 50 or older, once a year. For high-risk groups, once a year after the age of 30.