Suddenly one eye congestion generally how long can be eliminated need to be judged according to the cause of the disease, the eye into the foreign body usually need about 2 ~ 3 hours, allergies need about 1 ~ 2 days, infection needs about 2 ~ 3 days, depending on the individual situation there are some differences. 1. Eyes into the foreign body: If the eyes into the flying insects, sand and other foreign objects lead to eye congestion, remove the foreign body and wash the eyes in a timely manner about 2 to 3 hours after the congestion phenomenon eliminated by itself. 2. Allergy: If the eyes accidentally come into contact with allergens can also lead to allergic conjunctivitis, causing eye congestion, timely use of sodium cromoglycate eye drops and other antihistamines to fight allergies, usually about 1 to 2 days after the eye congestion will be eliminated. 3. Infection: for example, usually have the habit of rubbing the eyes with hands, when the hands are not clean, it is likely to bring bacteria into the eyes, resulting in eye infections and inflammation, causing eye congestion, timely use of antibiotic drugs such as levofloxacin hydrochloride eye drops anti-inflammatory sterilizing, usually about 2 to 3 days congestion symptoms will be eliminated. When the patient has congestion in the eyes, it is recommended to consult the relevant departments of regular medical institutions for examination, and the doctor will give the appropriate treatment plan according to the cause of the disease.