Patients who have a runny nose every day, if they have a clear watery nose, are often caused by allergic rhinitis. Patients may have allergic rhinitis because the nasal mucosa is exposed to dust, pollen, willow and other allergenic substances in the air environment, or to some chemical or irritating substances in the environment, resulting in the symptoms of runny nose every day, and often have nasal congestion, nasal itching, sneezing and other related symptoms. Some patients with purulent nasal discharge often suffer from acute and chronic sinusitis, in which the purulent secretions in the sinus cavity repeatedly overflow into the nasal passage, resulting in the performance of purulent nasal discharge every day, which may also be accompanied by obvious nasal congestion, headache, loss of smell and other related symptoms.