Phlegm on the right side of the throat may be related to pharyngitis, bronchitis, gastroesophageal reflux and so on. 1. Chronic pharyngitis, due to the stimulating effect of inflammation, can make the local production of a large number of secretions, may appear the symptoms of phlegm on the right side of the throat. 2. Bronchitis, when the bronchial tubes are attacked by bacteria and other pathogens, can cause an inflammatory reaction, which may lead to phlegm on the right side of the throat. 3. Reflux pharyngitis, if if the stomach contents reflux to the pharynx, can stimulate the mucous membrane to increase secretion, causing phlegm on the right side of the throat. This symptom can also be caused by local tumors, it is recommended that people with phlegm on the right side of the throat go to the hospital in time to clarify the cause of the disease, and carry out standardized treatment under the guidance of the doctor.