Old throat clearing may be related to postnasal drip syndrome, chronic pharyngitis, chronic bronchitis and other factors. 1. Postnasal drip syndrome: the feeling of mucus accumulating in the throat or dripping from the nasal cavity to the throat, caused by sticky mucus, pharyngeal muscles, swallowing abnormalities, often manifested by coughing, coughing up phlegm, frequent throat clearing and other symptoms, may appear to be always clearing the throat. 2. Chronic pharyngitis: when there is chronic inflammatory stimulation in the throat area, the mucous membrane of the throat will be congested and swollen repeatedly, and the phenomenon of throat clearing may occur all the time. 3. Chronic bronchitis: mostly caused by viral and bacterial infections or impaired immune function resulting in chronic inflammation, clinical manifestations of coughing, coughing up phlegm, wheezing, frequent throat clearing and other phenomena, which may lead to the phenomenon of always clearing the throat. If the phenomenon of throat clearing occurs, it is recommended to actively seek medical attention for a detailed examination, a clear diagnosis, standardized targeted treatment, to avoid delaying the condition.