Sinusitis can be categorized into acute sinusitis and chronic sinusitis, both of which can cause nasal regurgitation. In addition to this symptom, patients usually have other symptoms such as nasal congestion and headache. 1. Acute sinusitis: the main symptoms include nasal congestion, headache, olfactory impairment and pus. After the appearance of pus, it can flow back into the throat, and cause irritation to the throat, itching, nausea, cough and other symptoms. 2. Chronic sinusitis: its main symptoms are nasal congestion, head and face swelling and pain, olfactory dysfunction, fatigue, cough, runny nose, etc. Nasal secretions can flow back into the throat, causing cough and other discomforts. Sinusitis patients, nasal discharge backflow, should follow the doctor’s instructions for standardized treatment.