On the left side of the stomach are the spleen, liver, pancreas, descending colon and small intestine, the stomach is located in the center of the abdomen to the left, on the left side of the stomach is the location of the spleen, which is right next to the stomach, on the upper left side of the stomach is the location of the liver, at the back of the stomach there is also the pancreas, the pancreas is across the abdominal cavity of the human body, the left side of the stomach belongs to the pancreatic tail, and the lower left side of the stomach belongs to the intestinal tract, which is mainly a part of the small intestine and the descending colon. Once pain occurs on the left side of the stomach, you should be alerted to a lesion in the organ. If pain occurs on the upper left side of the stomach, you need to be alert to diseases of the liver, spleen and pancreas, accompanied by nausea, vomiting, dizziness and other symptoms. If pain occurs on the lower right side of the stomach, it is mainly related to intestinal diseases and is accompanied by abdominal pain, diarrhea, bloating and other sensations.