Firstly, please see a breast specialist when you find the following conditions: breast lump, nipple overflow especially bloody fluid, nipple erosion, local abnormality, local indentation of breast skin, orange peel-like changes of breast skin, newly appeared nipple indentation, breast pain, lump in the armpit, etc.; immediate family members with breast cancer, etc. If the lump is hard and grows gradually, especially within a short period of time, and if it is accompanied by blood flowing from the nipple, breast cancer should be highly suspected. Secondly, the breast specialist firstly palpates to determine whether there is any abnormality. The most commonly used examination techniques for breast diseases are mammography ultrasound and mammography. The first step is to determine the presence or absence of disease, and if a lump is found, it needs to be identified as benign or malignant. The main concern of patients is whether the lump is breast cancer or how high the risk of a benign lump becoming malignant is. For young women with dense breast glands, mammography may be less sensitive to some small cysts or benign lumps, which may easily lead to missed diagnosis, but mammography is more sensitive to the burr sign and microcalcifications of breast cancer Therefore, mammography is often needed once a lesion is detected by ultrasound, especially if it is difficult to determine benign or malignant. Simple cysts are usually benign, solid masses with clear borders, regular morphology, and a more uniform texture are more likely to be benign, while blurred borders, irregular morphology, and microcalcifications within the mass often suggest malignancy. If a lesion is found but cannot be judged as benign or malignant, a puncture biopsy or surgical excisional biopsy under imaging guidance can be performed to clarify the benignity or malignancy of the lesion. MRI (magnetic resonance imaging) or PET-CT may be recommended to assist in determining the benignity or malignancy of the mass before biopsy for patients who are financially able to do so. Third, regular follow-up is recommended for masses that are abnormal on clinical palpation and judged benign on imaging.