There are more possibilities of breast lumps in the clinic, and the more common ones are mastitis, breast hyperplasia, breast cysts, breast lipomas, breast fibroids, and breast cancer. It is necessary to combine the patient’s symptoms and ultrasound and other auxiliary examinations to clarify the cause of the disease. 1. Mastitis: bacterial infection of the breast is common and occurs during breastfeeding. Breast lumps can be touched, especially when breast abscess is formed, patients will have the typical manifestation of redness, swelling, heat and pain, and some patients may be accompanied by fever and other symptoms. 2. Breast hyperplasia: related to endocrine disorders in the body, belonging to the abnormal proliferation of breast tissue, regular breast pain can occur, mostly before menstruation, swelling and pain, after menstruation to reduce or disappear. 3. Breast cysts: they are benign lesions with a complete capsule and fluid inside, and usually have no discomfort. 4. Breast lipoma: benign tumor, composed of fatty tissue. It has no discomfort symptoms, is well demarcated from the surrounding tissues, and is easy to move. 5. Breast fibroma: benign tumor, mostly solitary, with smooth surface and clear boundary, painless lump in the breast. 6. Breast cancer: a painless and progressive enlargement of the upper outer quadrant of the breast, mostly poorly demarcated from the surrounding tissues and with a poorly smooth surface. It is often accompanied by nipple discharge, dimple sign, cellulite and other characteristic changes. At the same time, breast trauma, skin diseases can also appear in the case of breast lumps. There are many reasons for breast lumps, so it is recommended that the patient should consult a doctor in time and complete all auxiliary examinations in order to clarify the cause of the disease, and then a professional doctor will give the appropriate treatment measures according to the cause of the disease.