Breast cancer is a common and frequent disease that seriously threatens women’s health, yet many breast cancers are difficult to be detected at an early stage so far. In fact, it is not difficult to achieve early detection and early diagnosis of breast cancer, as long as you are careful and perform frequent self-examination of your breasts. Breast self-examination is very simple and can be done when you wake up, sleep, change clothes or take a bath. Self-examination in the mirror: First, face the mirror, cross your arms and observe the shape of your breasts. Then raise your arms above your head and carefully observe whether there is any change in the shape and contour of both breasts; whether there is any redness, rash, superficial venous anger, skin folds, orange peel-like changes and other abnormalities in the skin of the breasts; whether the nipples are at the same level, whether they are elevated, retracted or sunken, whether there is any abnormal discharge from the nipples and whether there is any change in the color of the areola. Finally, put down both arms, cross the waist with both elbows and work backwards, so that the chest muscles are taut, and observe whether both breasts are equal and symmetrical, and whether there are any abnormalities in the nipples, areolas and skin. Flat touch method: first take the supine position, right arm raised above the head, and a small pillow under the right shoulder, so that the right breast becomes flat. Then put the four fingers of the left hand together and use the palm of the fingertips to check for lumps or other changes in various parts of the breast. There are three methods of examination: one is the clockwise circular examination method, in which four fingers are used to examine the breast from the nipple area in a circular fashion from the inside out. The second is the vertical belt examination method, in which the four fingers are used to examine the entire breast from top to bottom. The third is the wedge examination method, in which the four fingers are used to examine the breast in a radial pattern from the nipple outward. The left breast is then examined in the same way, and the two breasts are compared for differences. Finally, use your thumb and index finger to gently squeeze the nipple, and report any clear or bloody discharge to the doctor. Shower examination method: When showering, it is easier to find breast problems because the skin is moist. This is done by slowly sliding the palm side of one finger and carefully examining all parts of the breast and armpits for lumps. Breast examinations should be performed frequently. The best time for breast self-examination is usually the 9th to 11th day after the onset of menstruation. This is when estrogen has the least effect on the breast and the breast is in a relatively static state, making it easy to detect lesions. Also note that bras should be worn properly, too tight, too thick, poor ventilation, will affect the normal circulation of lymphatic fluid in the breast, can not remove harmful substances in a timely manner, over time, easy to make breast cell lesions. There is no need to be nervous when self-examination reveals breast hyperplasia, because breast hyperplasia is not equal to pre-cancer, but we should not be paralyzed and should still insist on frequent self-examination. If there are cystic hyperplasia, lumps or nodules, they may develop into breast cancer, therefore, although the incidence is not high, they should be treated as soon as possible.