A smooth bulge in the nasopharynx is an abnormal phenomenon, which should not be raised under normal circumstances, and may be nasopharyngeal cysts, nasopharyngeal cancer and other diseases. 1. Nasopharyngeal cysts: generally occurring in adults, there is a smooth, hemispherical bulge in the nasopharynx, which is yellowish in color. If the cyst is relatively small, it will not cause poor ventilation; if it causes discomfort and poor ventilation, surgery can be considered. 2. Nasopharyngeal carcinoma: In the examination of nasopharynx, submucosal invasive nasopharyngeal carcinoma can be seen as submucosal elevation with smooth surface. Some of the early lesions are atypical, only showing mucosal congestion, vascularization or one side of pharyngeal crypt is fuller. Nasopharyngeal smooth protrusion is generally abnormal phenomenon, and it is recommended that patients go to the hospital in time for systematic examination and clear diagnosis, and diagnosis and treatment under the guidance of physicians, so as to avoid delaying the condition.