Constant runny nose like water needs to be treated according to its causes, such as allergic rhinitis, viral cold, cerebrospinal fluid nasal leakage, etc. After clear diagnosis, general treatment, medication and surgical treatment are chosen, and there is no quick solution. 1. Allergic rhinitis: Allergic rhinitis can show symptoms such as nasal congestion, runny nose, itchy nose, and so on, so there is a phenomenon of running nose like water all the time. Patients should be away from allergens, can follow the doctor’s instructions to use antihistamines, such as loratadine, cetirizine, while with intranasal glucocorticosteroids, such as trimethoprim nasal spray. 2. Viral colds: Viral colds attack the upper respiratory tract, causing a runny nose like water. Treatment can be prescribed with cold and flu medications, such as aminophenol xanthamin granules. 3. Cerebrospinal fluid leakage: cerebrospinal fluid leakage can cause a runny nose like water, the patient should choose the semi-recumbent position, while reducing the intake of sodium, can follow the doctor’s instructions to use glycerol fructose, mannitol to reduce intracranial pressure, if necessary, can choose to endoscopic cerebrospinal fluid leakage repair surgery. The reason why the nose has been running like water is many, after the symptoms should be timely to go to the hospital to improve the examination, in accordance with the doctor’s instructions to take standardized treatment, the above drugs should be used under the guidance of the doctor, can not be used indiscriminately, so as not to lead to adverse consequences.