Phlegm in the throat always want to hum, commonly caused by chronic pharyngitis, chronic rhinitis – sinusitis, chronic bronchitis and so on. 1. Chronic pharyngitis: If you have a long history of eating spicy and irritating foods, eating greasy foods, staying up late, smoking, alcoholism and other bad habits, you may stimulate the pharynx, chronic inflammation, stimulate the glands, resulting in excessive secretion, which is manifested as phlegm. 2. Chronic rhinitis – sinusitis: due to repeated bacterial, viral, fungal and other infections, it will stimulate the corresponding parts of the inflammatory secretion, continuous or intermittent backflow into the throat, resulting in the throat always feel phlegm. 3. Chronic bronchitis: chronic non-specific inflammation of the trachea, bronchial mucosa and its surrounding tissues. Clinical cough, cough sputum as the main symptoms, or wheezing, the onset of the disease lasts 3 months or more each year, for 2 years or more, often have a throat is always phlegm want to clear the throat behavior. It is recommended to consult a regular hospital in time for a clear diagnosis.