If your breast is too big it may cause several complications from back pain to migraines or even shortness of breath . Some women with large breasts tend to lean forward, pressing their thoracic outlet, a passageway full of nerves and blood vessels, causing constant pain on the area. A breast reduction surgery, also known as reduction mammaplasty is the surgery that removes excess breast tissue and fat reducing the breast’s size and, at the same time lifting it.