The posterior pharyngeal wall, the correct name is pharyngeal wall, when you open your mouth directly in front of your eyes is the posterior pharyngeal wall, by the level of the soft palate and the upper edge of the epiglottis will be divided into nasopharyngeal, oropharyngeal and laryngopharyngeal wall of the posterior part of the three parts, this is a common site of lymphoid follicular hyperplasia. Open mouth to see the last vertical surface of the oral cavity of the pharyngeal mucosa is the posterior pharyngeal wall, the tongue can be clearly exposed after the downward pressure, may feel nausea, want to vomit after touching. It consists of mucosa, submucosa, and fibrous layer. The mucosa of the posterior pharyngeal wall usually has scattered follicles, which is a normal phenomenon. The pharynx is susceptible to external irritants, including irritating gases, dust, and tobacco, leading to inflammation of the pharynx, including the posterior pharyngeal wall. The posterior wall of the pharynx may become congested and swollen with lymphoid follicular hyperplasia. The follicles vary in size, can be round or oval, and when there is inflammation, they may appear as pus spots, causing pain and fever in the pharynx. The pharynx is more likely to cause inflammation, daily life should maintain good habits, if there is discomfort in the pharynx, should promptly seek medical attention.