There are several common reasons for knee pain after drinking beer: 1. As the intake of alcohol will lead to an increase in anaerobic metabolism in the tissue metabolism around the knee joint, which leads to the accumulation of anaerobic metabolites, commonly lactic acid and creatine, which will stimulate the surrounding tissues and nerves to produce painful symptoms. 2. After drinking alcohol, human excitability will increase, and muscle excitability will also increase, which will produce excessive movement, excessive force, and poor limb control, 3. When there are metabolic diseases, such as gout, heavy alcohol consumption can lead to a rapid increase in blood uric acid, resulting in gouty arthritis and knee pain. When this happens, it is recommended not to drink alcohol for a long time or drink a lot of alcohol at one time. These are not good for the joints, and if joint pain always occurs, it can cause irreversible changes in the knee joint and produce serious consequences.