Red eyes after drinking alcohol may be a normal reaction to alcohol consumption, or may be caused by allergy to alcohol and metabolic disorders. 1. Normal reaction: under normal circumstances after drinking alcohol may lead to capillary congestion, there will be red eyes, generally stop drinking alcohol, to be completely metabolized out of the body, the symptoms will gradually reduce. 2. Alcohol allergy: Some people are allergic to alcohol, which can cause allergic reaction in a short period of time after drinking alcohol, thus causing redness of the eyes, accompanied by itching and rashes on the skin and other symptoms. 3. Metabolic disorders: If one’s metabolism is slow, the metabolism of the liver is blocked, and the alcohol is stored in the body for a long time, it may repeatedly stimulate the human organism, thus causing redness of the eyes. If your eyes keep reddening when you drink alcohol and are accompanied by other discomforts, it is recommended that you consult a doctor in time.