Self-examination of breast can help you understand your breast, remember its morphological features and feel. 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 raise the left hand, overhead, palm behind the head, = even breathing, with the right middle finger index finger ring finger belly together, flat on the left breast, in order to press, spiral or slide, in accordance with the sequence of external, external, internal, internal, three times, and then touch the armpit; then raise the right hand, overhead, palm behind the head, even breathing, left middle finger index finger ring finger belly Put your left middle finger, index finger and ring finger together, put them flat on the right breast in the same way, and check them in the same order, three times, and then touch the armpit. If you find any abnormal changes, 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.