Chronic pharyngolaryngitis can be caused by chronic overuse of the voice, environmental stimuli, infectious diseases and certain systemic diseases. 1. Long-term overuse of voice: For example, some singers, actors, teachers and other professionals may induce chronic laryngitis due to long-term overuse of voice or improper pronunciation. 2. Stimulation by environmental factors: For example, if you are engaged in chemical industry, dust industry or high temperature for a long time, chronic laryngitis may be caused by the long-term stimulation of the above factors. 3. Infectious diseases: commonly found in upper respiratory tract infections, rhinitis, sinusitis, pneumonia and other infectious diseases, chronic pharyngolaryngitis may be caused by the recurrence of these infectious diseases, resulting in inflammatory secretions flowing into the throat. 4. Certain systemic diseases, such as rheumatism, diabetes, cardiac and renal diseases, can easily lead to vasodilatation dysfunction, resulting in long-term bruising of the throat, thus causing secondary chronic pharyngolaryngitis. Chronic pharyngitis may also be caused by other reasons, when the symptoms of chronic pharyngitis, it is recommended to consult a doctor as soon as possible, after a clear diagnosis of the causative factors, to give targeted treatment and conditioning.