Posterior pharyngeal wall follicles are proliferation of lymphoid tissue, mostly characterized by inflammatory reactions in the pharynx, due to mucosal damage, follicle rupture can bleed. Lymphoid follicles are produced by bacterial and viral infections, stimulation of adverse physical and chemical factors, and allergies, etc. Bacterial and viral infections, allergies, gastroesophageal reflux, long-term alcohol abuse, exposure to harmful gases and other factors can cause inflammation of the pharynx. Local manifestations of chronic congestion, hypertrophy of the mucosa, and the presence of extensive hyperplasia of connective tissue and lymphoid follicles under the mucosa of the pharynx. They form granular projections on the posterior pharyngeal wall and sometimes even fuse with pus. Because the hypertrophied, congested mucosa is brittle and easy to bleed, when laryngitis occurs foreign body sensation, itchy throat and other symptoms, it is easy to cause violent coughing, resulting in follicles and mucous membrane rupture. It is recommended that patients actively treat the inflammation of the throat to avoid aggravation of the condition, and promptly seek medical attention after bleeding.