Follicular hyperplasia of the posterior pharyngeal wall is considered to be caused by acute and chronic pharyngitis, chronic tonsillitis, nasal diseases, and pharyngeal reflux. 1. Acute and chronic pharyngitis: due to the stimulation of bacterial infection, or viral infection repeatedly stimulate the mucous membrane of the pharynx, can lead to mucosal hyperplasia, often accompanied by throat itching, dry cough and other symptoms. 2. Chronic tonsillitis: both sides of the tonsils are located close to the back wall of the pharynx, when suffering from chronic tonsillitis recurrent inflammation, inflammatory stimulation can accumulate the mucous membrane of the back wall of the pharynx is congested and edematous, and in severe cases, it can lead to the posterior pharyngeal wall of the follicular hyperplasia. 3. Nasal diseases: when suffering from chronic rhinitis, sinusitis and other diseases, nasal secretion will increase significantly, the secretion can flow through the nasopharynx to the pharynx, and the bacteria in the secretion can stimulate the mucous membrane of the posterior pharyngeal wall to become congested and edematous, hyperplasia. 4. Pharyngeal reflux: Reflux esophagitis is common. Reflux esophagitis is mainly due to the reflux of excess stomach acid through the esophagus to the pharynx. After the reflux material enters the posterior pharyngeal wall, it can stimulate the mucosa of the posterior pharyngeal wall to appear lymphoid follicular hyperplasia. Follicular hyperplasia of the posterior pharyngeal wall needs to be examined and treated in a timely manner to avoid delaying the condition.