Normal mucosa of the posterior pharyngeal wall is light red, smooth and moist, sometimes a few mildly dilated veins and scattered small lymphoid follicles can be seen, such as follicles are more large or fused into a piece, it is not normal, commonly found in reflux pharyngitis, chronic pharyngitis and so on. 1. Reflux pharyngitis: sleep, intra-abdominal pressure, decreased peristaltic function of the esophagus may lead to esophageal reflux, esophageal reflux of gastric acid will stimulate the patient’s pharyngeal mucosa, which leads to the back wall of the throat follicles of abnormal symptoms. 2. Chronic pharyngitis: This disease is a chronic inflammation of the submucosa of the pharynx and the lymphatic tissue. Inflammation of the mucosa of the pharynx and submucosal lymphatic tissues can lead to chronic congestion, expansion of the mucosa, lymphatic tissue hyperplasia and fusion to form follicles, which is an abnormal phenomenon. Symptoms such as pharyngeal dryness, itching, and irritating cough may also occur. When there are follicles on the back wall of the throat, you can go to the ENT department of the hospital for examination and standardized treatment under the guidance of the doctor for a clear diagnosis.