In the course of outpatient treatment, we often see many patients come to the clinic because of breast pain, and many of them suspect that they have breast cancer and are very frightened. In fact, most of the breast pain is due to anxiety and anger, mental stress, diet and menstrual cycle, most of them are normal and do not need treatment. In general, breast cancer is not painful in the early stage, and it mostly appears as a painless, hard lump.