Upper abdominal pain with back pain the day after drinking may be caused by acute gastritis, acute pancreatitis, coronary heart disease and other reasons. 1. Acute gastritis: excessive alcohol consumption may lead to gastric mucosal erosion and mucosal bleeding, inducing acute gastritis, which is manifested as epigastric pain after drinking, and if the mucosal damage of the back wall of the stomach, the pain may also radiate to the back. 2. Acute pancreatitis: Alcohol can promote pancreatic secretion, but also in the pancreas metabolism can activate the inflammatory reaction, resulting in acute pancreatitis, manifested as acute epigastric pain after drinking, often more intense. When the pancreatic secretion stimulates the peritoneum and retroperitoneal tissue, it can be manifested as radiating pain in the back. 3. coronary heart disease: alcohol is a common cause of angina pectoris, angina pectoris manifested as post-sternal or sub-sternal pain, the pain can be radiated to the back, sometimes the patient will be due to the pain site by the lower part of the stomach and mistakenly thought that it was a stomachache, so the second day of the epigastric pain with back pain after drinking may also be angina pectoris. There are many other causes of epigastric pain with back pain the day after drinking, it is recommended to go to the hospital to clarify the cause of the disease, and follow the doctor’s instructions to avoid delaying the condition.