The organs below the left side of the ribs are, from top to bottom, the left lung, the heart, the stomach, the pancreas, the spleen, the left half of the transverse colon, and the left half of the descending colon. 1. Left lung: the tip of the lung is usually on the clavicle, and the base of the left lung is at the intersection of the sixth rib and the midline of the clavicle. 2. Heart: The heart starts from the left side under the second rib, and the left inferior point is located in the left fifth intercostal space. 3. Stomach: The upper left end of the stomach is located at the 11th to 12th ribs on the left side. 4. Pancreas: The pancreas is in the left quarter rib area, approximately directly behind the stomach. 5. Spleen: The spleen is located in the left quarter rib region at approximately the 9th to 11th ribs. 6. The left half of the transverse colon and the left half of the descending colon: the transverse colon is connected to the greater curvature of the stomach by the gastrocolic ligament above the transverse colon, and to the greater omentum below it; the descending colon is deeper than the ascending colon, and is located from the left side of the ribcage and the lumbar region down along the lateral border of the left kidney to the lower pole of the left kidney, and then turns slightly to the medial side to the lateral border of the psoas major muscle. If the left side of the rib cage below the pain and other conditions, should be timely to the relevant departments of the hospital for a comprehensive examination, so as not to delay the condition.