The reasons for swollen eyes after drinking are as follows: 1. Allergies: If a small amount of alcohol is consumed and the eyes swell, or even have itchy eyes, the edema is more obvious, this may be an allergy to alcohol, accompanied by redness and swelling of the whole body after drinking, rashes, etc. 2. Kidney disease: Whether drinking more or less, when the kidneys have disease there will be edema of the eyes, the kidneys have a very strong excretory function. The kidneys have a very strong excretory function, when the kidney function is impaired, the excretory function is abnormal, after drinking alcohol can not be metabolized in a timely manner, accompanied by kidney disease will appear after drinking alcohol, facial and eye swelling, this situation needs to go to the hospital to check the whole body related items, such as urinary routine, blood routine, kidney function, etc. 3, excessive drinking: will also appear eye swelling, it may be the stimulating effect of alcohol, after drinking alcohol led to capillary After drinking alcohol, the capillaries dilate and exude, which leads to swollen eyes.