As long as a little cold on the runny nose may be due to low immunity and allergic rhinitis, or suffering from vasomotor rhinitis caused. 1. Low immunity is generally due to the body’s resistance to poor, so that the phenomenon of a little bit of cold on the phenomenon of a runny nose, usually need to exercise, eat more fruits and vegetables, less late at night, and develop a good healthy lifestyle habits. 2. Allergic rhinitis is generally due to the allergic reaction of susceptible individuals after contact with external allergens, manifested as itchy nose, sneezing, runny nose, nasal congestion, itchy eyes and other symptoms, you can use cetirizine, loratadine and other drugs for treatment. 3. Patients with vasomotor rhinitis have autonomic nerve dysfunction and excessive inflammatory reaction when they are subjected to physical and chemical stimuli, which leads to the phenomenon of non-stop runny nose. As long as a little bit of cold on the runny nose first to determine the cause of the disease, generally can be treated by drugs, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, listen to the doctor’s advice for treatment.