Small bumps on the posterior wall of the pharynx are mostly lymphoid follicular hyperplasia on the posterior wall of the pharynx, which has many causes, such as acute pharyngitis, chronic pharyngitis, tonsillitis and so on. 1. Acute pharyngitis: after the stimulation of viral or bacterial infection, the lymphatic tissue under the mucosa of the posterior wall of the pharynx often forms follicular hyperplasia and edema, which usually disappears on its own after the elimination of inflammation. 2. Chronic pharyngitis: most of them are caused by the combination of acute pharyngitis recurrence, bad dietary habits, long-term smoking and other factors, and may also be accompanied by pain, foreign body sensation in the throat. 3. Tonsillitis: tonsillitis attack will also spread to the back wall of the pharynx caused by this performance, but also accompanied by tonsil enlargement, fever, pain and other phenomena. There are other reasons why there are small bumps on the back wall of the pharynx, it is recommended to actively consult a doctor for a clear diagnosis, under the guidance of the doctor to take standardized treatment, not to ignore the symptoms, take it lightly.