Pharyngitis refers to the inflammation of the mucous membrane of the pharynx, narrowly defined as pharyngitis, which refers to the inflammation of the mucous membrane of the posterior wall of the oropharynx, that is, the inflammation of the posterior wall of the pharynx that can be seen when the mouth is opened. When there is inflammation, you can see small red dots, which are local lymphoid follicular hyperplasia, small scattered granular red dots, and large can be fused into a sheet. The pharynx is divided into the nasopharynx, oropharynx and laryngopharynx, and pharyngitis in a broad sense includes inflammation of the mucous membrane of the nasopharynx, inflammation of the mucous membrane of the oropharynx, inflammation of the mucous membrane of the laryngopharynx, such as nasopharyngitis, tonsillitis, that is, palatine tonsillitis, lingual tonsillitis, and lingual tonsillitis are all part of pharyngitis.