When there is a vague pain under the left breast, it is recommended to consult the Department of Breast Surgery or the Department of Cardiovascular Medicine. Breast surgery is recommended when there is a vague pain under the left breast with cyclic swelling associated with the menstrual cycle. Breast surgery is recommended when there is pain in the left breast, nipple discharge, or if there are localized skin changes such as redness, an orange peel appearance, or localized skin dimpling. If the pain under the left breast is crushing in nature, accompanied by radiating pain in other parts of the body, or if there is a sense of dying, especially if you suffer from cardiovascular diseases, and if the pain under the left breast occurs after exertion or anger, it is recommended to consult the Emergency Department of Cardiovascular Medicine. There are many other causes of pain under the left breast, it is recommended to go to the hospital in time, and early formal treatment.