Watery nose can be caused by physiological reaction, acute rhinitis, ruptured sinus mucous membrane cysts, cerebrospinal fluid leakage and other reasons. 1. Physiological reaction: some people may be due to the stimulation of the cold air leads to the flow of water inside the nose, if a small amount of cold air, as well as stimulating food may cause involuntary flow of watery nasal discharge. 2. Acute rhinitis: acute rhinitis is an inflammatory disease caused by viral infection. Early manifestations of nasal dryness, burning sensation, itching, sneezing, followed by a large amount of watery nasal discharge. 3. Sinus mucous membrane cyst rupture: If the fluid coming out of the nose is watery, usually yellowish, and more from one side of the nostril, then the patient should consider whether it is caused by the rupture of the sinus mucous membrane cyst. 4. Cerebrospinal fluid nasal leakage: cerebrospinal fluid flows into the nasal cavity due to cranial base lesions. It is characterized by the flow of clear liquid from the nasal cavity, decreased sense of smell or loss of sense of smell. When the patient’s nose flows clear water inside, he needs to go to the hospital in time for detailed examination and actively cooperate with the doctor for treatment.