The causes of clear water nasal discharge may be acute rhinitis, allergic rhinitis, cerebrospinal fluid nasal leakage, etc. According to the primary disease, targeted treatment. 1. Acute rhinitis: acute rhinitis is part of the upper respiratory tract infection caused by viral infection, which is a self-limiting disease, with common symptoms such as runny nose, lethargy and fever. It is recommended to use ephedrine nasal drops, nasal glucocorticoid and other symptomatic treatment. 2. Allergic rhinitis: also known as allergic rhinitis, contact with allergens such as pollen, dust mites, etc., continuous sneezing, watery nasal discharge, nasal itching and so on. It is recommended to avoid contact with allergens, use antihistamines such as loratadine, nasal glucocorticosteroids such as budesonide, and rinse the nasal cavity with saline. 3. Nasal leakage of cerebrospinal fluid (CSF): the common causes are craniocerebral injury, history of nasal surgery, clinical manifestations such as watery fluid, mostly unilateral, etc. It is recommended to choose whether to operate according to the severity of the disease. It is recommended to choose whether or not to operate according to the severity of the disease, and choose the head-high lying position, low-salt diet, limiting the amount of liquid intake, avoiding coughing, and so on. Watery nasal discharge may also be caused by vasomotor rhinitis, it is recommended to go to the hospital in time, to clarify the cause, under the guidance of the doctor’s treatment.