Under the breasts are divided into the standing position and the lying position. The organs under the breasts in the standing position are the liver, gallbladder, stomach, pancreas, etc. The organs under the breasts in the lying position are the heart, lungs, etc. The organs under the right breast are the stomach, pancreas, spleen, duodenum, small intestine and colon. 1. Standing position: in the standing position, the organs under the left breast are stomach, pancreas, spleen, duodenum, small intestine and colon; the organs under the right breast are mainly liver, gallbladder, small intestine, colon and other intestines, and the lower and back sides are mainly bilateral kidneys and ureters. 2. Prone position: when the patient is in the prone position, the organs in the chest cavity are mostly underneath the breasts, with the heart, left lung and stomach underneath the left breast, and the right lung underneath the right breast. When there is pain under the breast and other discomforts, it is necessary to consult a doctor in time and complete all the examinations in order to clarify the cause of the disease.