The edema of eyes after drinking is mostly caused by alcohol allergy and conjunctivitis. 1. Alcohol allergy: part of the population is allergic to alcohol, so after drinking alcohol can be due to allergic reactions leading to edema of the eyes, but also the whole body rashes, itching and other uncomfortable symptoms. 2. Conjunctivitis: due to external stimuli or autoimmune factors can lead to inflammation of the patient’s conjunctival tissue, under the stimulation of inflammation, the patient may appear conjunctival congestion, eye swelling, photophobia, tearing and other uncomfortable symptoms. After drinking alcohol, blood circulation increases, and eyelid swelling can be aggravated, so patients may have swollen eyes after drinking alcohol. It is recommended that patients who experience significant discomfort after drinking alcohol should seek prompt medical attention to assess their condition and treat them under the guidance of a physician.