Some of the symptoms are physiological, such as cold or tearing, which can be relieved by adjusting the symptoms. Excluding physiological factors, the main consideration is caused by diseases, common causes include colds, rhinitis, nasal polyps and cerebrospinal fluid leakage, etc. Specific treatment options include medication, surgical treatment and daily care. 1. Physiological reaction (1) Cold: After being exposed to wind and cold, the nasal mucosa will be stimulated, which will lead to increased secretion and cause runny nose, which can be relieved by entering a warm environment. (2) Tears: After a lot of tears, the tears enter the nasal cavity through the nasolacrimal duct, which can lead to related symptoms, and can be recovered by stopping crying. 2. Pathological conditions (1) Colds: upper respiratory tract infections can lead to mucosal edema, oozing and increased secretions, resulting in a runny nose, and can be treated with medications for colds, such as compound aminophenolamine capsules. (2) Rhinitis: clinically, allergic rhinitis is the most common, and localized allergic inflammation will cause related symptoms, and nasal sprays, such as fluticasone propionate, can be applied. (3) Nasal polyps: Nasal polyps cause repeated irritation of the surrounding mucosa, which can also cause related symptoms, and the swelling can be removed through surgery. (4) Cerebrospinal fluid (CSF) leakage: Fractures caused by trauma can lead to runny nose due to CSF leakage, which can be repaired by surgery. If the runny nose cannot be relieved on its own, it is necessary to consult a doctor in time for observation and standardized treatment under the guidance of a clinician after diagnosis of the disease, so as to avoid delaying the disease.