Back pain after drinking alcohol may be caused by coronary heart disease, or it may be caused by pancreatitis and other reasons. 1. coronary heart disease: after drinking alcohol, due to the role of alcohol, will cause the expansion of capillaries throughout the body, increasing the load on the heart muscle, if the heart itself exists in the coronary artery stenosis or congenital heart disease, resulting in further ischemia, hypoxia of the coronary artery supplying the heart, inducing angina pectoris or infarction, there will be a left side of the limbs, the left side of the back of the radiating pain. 2. Pancreatitis:Drinking a lot of alcohol is the main cause of acute pancreatitis. Alcohol destroys the alveolar cells in the pancreatic tissues, causing the pressure in the main pancreatic duct to rise sharply, causing a large amount of pancreatic enzymes to be released into the bloodstream, and then the pancreas’s self-digestion and dissolution occur, leading to the occurrence of pancreatitis. When pancreatitis occurs, it may likewise cause referred pain in the left side of the back. Back pain after drinking alcohol may also have cold, trauma, uric acid increase, etc. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.