Runny nose may be allergic rhinitis, acute rhinitis, vasomotor rhinitis and other diseases, need to address the cause of the symptomatic treatment. 1. Allergic rhinitis: clear running nose may be caused by allergic rhinitis, which may be accompanied by itching, sneezing and other discomforts. Oral antihistamines and glucocorticosteroids can be used under the guidance of a doctor to treat the symptoms. 2. Acute rhinitis: Clear nasal discharge may also be caused by viral infection of acute rhinitis. Patients can take oral antipyretic and analgesic drugs, such as acetaminophen, ibuprofen, etc., or oral antihistamine drugs such as loratadine and diphenhydramine. 3. Vasomotor rhinitis: clear nasal discharge is also considered to be caused by vasomotor rhinitis. Patients need to follow the doctor’s instructions nasal glucocorticosteroids, such as budesonide, fluticasone propionate, etc., or oral antihistamines, such as cetirizine, loratadine and so on. There are many reasons that lead to clear nasal discharge, it is recommended that patients go to the regular hospital, identify the cause of the disease, and follow the doctor’s instructions for treatment.