A runny nose may be caused by acute rhinitis, chronic rhinitis, allergic rhinitis, sinusitis and so on. 1. Acute rhinitis: acute inflammation of nasal mucosa caused by viral infection. Clinical manifestations are fever, headache, myalgia and general malaise, often accompanied by sore throat, dry cough, there may be nasal congestion, runny nose, initially watery, then mucopurulent, combined with bacterial infection may have pus. 2. Chronic rhinitis: symptoms manifested as nasal congestion, increased nasal discharge, accompanied by decreased sense of smell, etc., and in more serious cases, there may also be postnasal drip, headache phenomenon. 3. Allergic rhinitis: allergic inflammatory disease of the nasal mucosa after contact with allergens, the main symptoms are nasal itching, sneezing, runny nose, nasal congestion and other symptoms. Treatment is mainly anti-allergy and nasal spray hormone therapy. 4. Sinusitis: an inflammatory disease of the sinus mucosa. Acute sinusitis sometimes has systemic symptoms, chills, fever and headache, etc. Chronic sinusitis is dominated by local symptoms, and the local symptoms of sinusitis mainly include nasal congestion, runny nose, smell disorders, headache and other symptoms. In daily life, avoid catching cold, drink more hot water, eat more fresh vegetables and fruits, pay attention to rest, eat less spicy food, and properly strengthen physical exercise. There are many reasons for excessive nasal discharge, if the above symptoms occur, you should consult a doctor in time and under the guidance of the doctor.