The fact that there is always phlegm sticking to the throat may be caused by chronic pharyngitis, chronic bronchitis, chronic rhinitis, sinusitis, reflux pharyngitis, etc. The most common cause of pharyngitis is the increase of secretions in the throat due to the chronic inflammatory reaction in the throat area. 1. Chronic pharyngitis: due to the existence of chronic inflammatory reaction in the throat area, long-term stimulation by inflammatory factors, leading to an increase in secretions in the throat area, which manifests itself as always having phlegm sticking to the throat, and may be accompanied by symptoms such as dry pharynx, itchy pharynx, and sore pharynx. 2. Chronic bronchitis: due to the presence of chronic inflammatory reaction of the tracheobronchial mucosal tissue, stimulation by inflammation can lead to an increase in tracheal secretions, resulting in the throat is always phlegm sticky, may also be accompanied by chest tightness, cough and other symptoms. 3. Chronic rhinitis, sinusitis: due to the presence of inflammatory reaction in the nasal cavity, resulting in increased nasal secretions, especially when the patient is lying down, it is easy to cause nasal secretions flow into the pharynx, resulting in the throat is always phlegm sticking, but also can be accompanied by nasal congestion, dizziness, runny nose and other symptoms. 4. Reflux laryngitis: Laryngopharyngeal reflux is due to the reflux of gastric contents into the pharynx, irritating and damaging the pharyngeal mucosa and causing the corresponding symptoms. There is always phlegm sticking to the throat, it may also be caused by other reasons, it is recommended to consult a doctor as soon as possible to diagnose the cause of the disease, and then give targeted treatment.