Breast cancer is a common malignant tumor in women and its incidence is increasing year by year. It is a superficial tissue tumor and early detection and diagnosis is not difficult to facilitate a good prognosis. Early symptoms include the following: (1) Single or multiple painless lumps in the breast, mostly in the upper outer quadrant of the breast (near the armpit where the glands are most numerous), which are mostly discovered unintentionally. (2) Nipple discharge, especially in women over 40 years of age or over 59 years of age, or if the discharge is unilateral or bloody, especially if it is accompanied by a lump in the breast area, must be taken seriously. (3) Limited glandular thickening of the breast. This symptom is often misdiagnosed as breast hyperplasia, but in a few patients, there is a possibility of hidden cancer in the thickened glands. (4) Skin changes in the breast: ① “dimple” skin (indentation of the skin on the surface of the lump); ② superficial varicose veins; ③ limited skin redness and swelling (mainly seen in inflammatory mastitis); ④ edema of the skin in the form of “orange peel” (skin edema) (5) skin lumps and ulcers, and “satellite” nodules around the lumps. (5) Nipple changes: (1) Eczema-like carcinoma will show symptoms of flaking and erosion, accompanied by itching, crusting and shedding of nipples, which will not heal for a long time; (2) Retraction and fixation, unilateral nipple retraction in adult women, which is gradually aggravated and fixed, should be taken seriously and can occur in both early and late stages of cancer. (6) A few patients will have breast pain, and breast pain is often not related to breast cancer.