There is always phlegm at the junction of the upper jaw of the throat and the nasal cavity may be due to pharyngitis, nasopharyngitis and posterior nostril nasal polyps and other causes. 1. Pharyngitis: it is generally an inflammation at the soft palate, which manifests itself as a foreign body sensation in the soft palate, excessive secretion of small salivary glands in the soft palate, pain in the soft palate, etc. It can be treated with watermelon cream spray, gargling with compound borax solution, and applying 10% silver nitrate to the ulcerated surface. 2. Nasopharyngitis: generally due to the inflammation of the mucosa, submucosa and lymphatic tissues of the nasopharynx, manifested as nasopharyngeal foreign body sensation, running watery or mucopurulent mucus, coughing, phlegm and other symptoms, you can use pharyngitis tablets, Xinyi nasal drops and other drugs for treatment. 3. Posterior Nasal Polyp: This disease is caused by inflammatory hyperplasia such as maxillary sinus polyp or inferior turbinate polyp which grows towards the nasopharynx after contacting and compressing the soft palate to cause a foreign body sensation and mucus over secretion, which produces this symptom. There is always phlegm at the junction of pharyngeal palate and nasal cavity may also be caused by rhinitis – sinusitis, bronchitis, allergic rhinitis, etc., you need to go to the hospital in time to get a clear diagnosis, and listen to the doctor’s advice for standardized treatment.