Frequent phlegm in the throat may be caused by chronic pharyngitis, reflux pharyngitis, chronic sinusitis, bronchitis or pneumonia, etc. The cause should be clearly defined and treated. 1. Chronic pharyngitis: it may be caused by bad dietary habits and environmental factors, which may cause chronic inflammatory stimulation in the throat area, and you will often feel phlegm, which may be accompanied by dry throat, sore throat, bad breath and other symptoms. 2. Reflux pharyngitis: stomach contents reflux to the throat, stimulate the mucous membrane of the throat, produce a foreign body sensation in the throat, feel phlegm in the throat, and produce the symptom of repeated throat clearing. 3. Chronic sinusitis: chronic sinusitis sinus secretions flow back into the nasopharynx through the nasal cavity, causing frequent phlegm symptoms in the throat. 4. Bronchitis or Pneumonia: may be associated with pathogenic microbial infections, allergic reactions and other factors, will make the pharynx often present phlegm, but also accompanied by fever, cough and other symptoms. Phlegm is often present in the pharynx, it is recommended to consult the hospital and follow the doctor’s instructions for treatment after the diagnosis is clear.