Self-examination of the breasts can help you understand your breasts, remember their morphological characteristics and the feeling of touching them, and if you find any slight changes that are different from the usual ones, go to the hospital as soon as possible to help detect breast cancer earlier. For women with normal menstruation, the best time for breast examination is the 9th to 11th day after menstruation. For menopausal women, the examination is done on the same day of the month. Screening can also be done in the shower, as it is easier to detect breast problems due to wet skin. If a lump appears during breastfeeding and is clinically suspected to be a tumor, it should be done after weaning. Self-examination methods are as follows: First look: stand in front of a mirror under bright light, with eyes level, feet shoulder-width apart, arms hanging naturally, and breathe calmly; focus on observing whether the bilateral breasts are symmetrical and consistent, whether the skin has indentations, and whether the color of the skin is the same; observe whether the nipples on both sides are at the same height, whether there is nipple retraction and depression, and whether the nipples and areolas are flaky or oozing with fluid; observe whether the breasts are at the same height when expanding the chest. Observe whether there is any abnormality in the combination of the upper part and the armpit, observe the side of the breast when the body is turned sideways, and see whether there is any abnormal change in the curved contour of the breast; see whether there are different lines of the breast caused by the protrusion of foreign bodies. Second touch: focus on palpation of the breast for lumps, pressure pain, and hard nodes and pressure pain in the armpit. After standing up, raise your arm and check the right breast with your left hand and the left breast with your right hand, using the belly of your finger, which is more sensitive and parallel to the chest wall. If this is the case, it is easy to mistake the normal breast gland tissue for a lump. When examining the breast, you should pay attention to whether there are any lumps in the breast, whether there are any skin depressions, whether there is fluid or bloody fluid coming out of the nipple, and whether there are any enlarged lymph nodes under the armpit. First of all, raise your left hand over your head, put your palm behind your head, breathe evenly, put your right middle finger, index finger and ring finger together, put it flat on your left breast, press, spiral or slide it, check it in order, three times, and then touch your armpit; then raise your right hand over your head, put your palm behind your head, breathe evenly, put your left middle finger, index finger and ring finger together The left middle finger, index finger and ring finger together, is placed flat on the right breast in the same way, in accordance with the sequence of external upper, external lower, internal lower, internal upper, check in turn, back and forth three times, and then touch the armpit. If abnormal changes are found, you should immediately go to a regular hospital and ask a specialist for an examination. The physician will draw the correct conclusion by asking medical history, physical examination, impression diagnosis, pathological diagnosis, and timely treatment to maintain your health.