Constant runny nose may be due to allergic rhinitis or upper respiratory tract infection. It can be treated according to the cause. 1. Allergic rhinitis: When the seasons change or when you are too sensitive to certain stimuli, you will have symptoms such as running nose, sneezing, itchy nose and eyes, etc. The treatment requires oral antiallergic drugs such as loratadine and cetirizine. Treatment requires oral anti-allergy drugs such as loratadine, cetirizine, etc., glucocorticoid nasal spray, such as fluticasone propionate nasal spray; at the same time, saline rinse nasal cavity, and pay attention to warmth, go out and wear a mask. 2. Upper respiratory tract infection: bacterial or viral infection of the upper respiratory tract will also have a runny nose, sneezing, coughing, chills, fever and other symptoms, the treatment can be oral antiviral drugs Lianhua Qingdian, Ribavirin, or cold and fever particles, and pay attention to warmth, drink a lot of water, and avoid exertion. The clear nasal discharge, may also be vasomotor rhinitis, etc., suggest timely medical examination, clear diagnosis, follow the doctor’s instructions for medication.