The feeling of phlegm sticking to the throat may be caused by chronic pharyngitis, sinusitis, bronchitis and so on. 1. Chronic pharyngitis: repeated chronic pharyngeal inflammation, caused by pharyngeal submucosal gland hyperplasia, mucosal congestion, affecting the mucosal surface of the cilia function, will secrete viscous secretions, sticking in the throat is not easy to cough up, it will form the throat feel phlegm. 2. Sinusitis: Inflammation of the sinuses can lead to purulent nasal secretions flowing back into the posterior wall of the pharynx, causing the feeling of phlegm in the throat. 3. Bronchitis: Inflammation of the airways can produce a lot of phlegm, and when coughing, the phlegm secretions will go up from the airways to the throat, causing the feeling of phlegm in the throat. Therefore the presence of phlegm in the throat, should be hospitalized, under the guidance of the doctor to clarify the cause of the disease, standardized treatment.