With the development of society and economy, the incidence rate of breast cancer is getting higher and higher, and its incidence rate has risen to the first place of female malignant tumors in Shanghai and other big cities. How can the patients themselves find out the breast disease at an early stage? The most common and effective method is breast self-examination, the best time to arrange for the examination is between two menstrual periods, because at this time the volume of the mammary gland is the smallest, the physiological breast swelling is completely eliminated, and the slight abnormality of the mammary gland is the easiest to find; the scope of the breast examination should include all the areas of the distribution of mammary gland tissues, the armpit and the supraclavicular fossa. Examination method: 1. Firstly, sitting breast visualization is carried out, and attention should be paid to the following abnormalities if they appear in the breast recently: localized elevation or concavity of the breast, changes in the size of the breast, localized edema of the breast, reddening of part of the skin, veins, nipple concavity or deviation, nipple overflow, vesiculation, crusting, and desquamation, and so on. 2, and then do breast palpation, the method is the middle three fingers together, metacarpophalangeal joints slightly curved, the end of the knuckle finger belly (rather than the fingertips) flat on the breast to touch, do not use the palm pinch to hold the mammary glands, so as to avoid the appearance of the swelling of the false impression. 3, the best check in a certain order, the purpose is not to miss each lesion, sitting position is the best position to check the armpits, supraclavicular fossa, and then lying down to check the breast tissue again, the examination should also pay attention to the comparison of the two sides, so that it is easier to find small lesions.