White spots on the posterior pharyngeal wall may be associated with acute tonsillitis, tonsil stones, herpes pharyngitis, lymphoid follicular hyperplasia and other causes. 1. Acute tonsillitis: when the tonsils are infected by bacteria, it can promote the proliferation of glands in the crypt fossa of the tonsils, leading to inflammatory reaction of the tonsils, and then the pus discharged, which will form white rice grains on the surface of the tonsils. 2. Tonsil stones: Due to the long-term blockage of the tonsil crypt, it will lead to obstruction of secretion discharge, which will trigger the bacterial metabolite stones attached to the tonsils. When the tonsil stones are dislodged, they may flow towards the posterior wall of the pharynx, resulting in adherence to the posterior wall of the pharynx, which will lead to the appearance of white spots on the posterior wall of the pharynx. 3. Herpes pharyngitis: caused by coxsackie virus infection, often sudden onset of fever and sore throat, at the beginning of the pharynx is congested, and there is grayish-white herpes, surrounded by a red halo, 2 to 3 days after the red halo intensified and expanded, herpes broke out to form a yellow ulcer. Herpes mainly occurs in the pharynx and soft palate, tongue. 4. Lymphoid follicular hyperplasia: When the lymphoid follicles in the posterior wall of the pharynx are infected, it can lead to their hyperplasia, and obvious white spots can appear in the posterior wall of the pharynx. If white spots appear on the posterior wall of the pharynx and are accompanied by other discomforts, it is recommended to go to the hospital for an examination to clarify the cause of the disease, so that targeted treatment can be carried out.