With the improvement of living standard and the enhancement of self-care awareness, more and more women start to pay attention to their own health, and many women will often do self-examination of their breasts. Once a breast lump is found, some people will worry about breast cancer all day long, while others have the opposite attitude and let it go, resulting in delaying the disease. What should we do when we find a breast lump? Breast lumps are an extremely common disease with many causes, including benign, malignant and junctional. Benign ones include: fibroadenoma, cyst, lipoma, mastopathy mass, intraductal papilloma, inflammatory mass, etc.; malignant ones include primary and secondary breast cancer; junctional ones are mainly lobulated tumors. Usually, breast “lumps” that vary with the menstrual cycle and are accompanied by swelling and pain are the typical manifestations of breast disease. The enlarged breast tissue forms nodules or lumps, which are not tumors in the true sense of the word. Fibroadenomas, which occur in young adolescent women, are tough, smooth, mobile lumps that may be due to localized hypersensitivity of the breast tissue to estrogen and require surgical removal once detected. It can be caused by poor milk secretion during lactation and can lead to acute mastitis, which is characterized by localized hard nodules, redness of the skin, increased skin temperature, pain and fever, and in severe cases, localized fluctuations indicating the formation of an abscess. Painless, solitary, hard lumps are especially important, as they are often a sign of breast cancer. In fact, the best way to detect a breast lump is to go to the hospital in time for examination. Through medical examination and some auxiliary examinations such as mammography, mammography and MRI, the nature of breast lumps can be determined and the doctor will make appropriate treatment according to different lumps. Regular breast checkups in the hospital can help detect breast diseases at an early stage; strengthening exercise, happy mood, regular sleep, light diet, high fiber and low fat, and breastfeeding can keep you away from breast diseases.