Infection of the parapharyngeal space is characterized by erythema of the lateral pharyngeal wall and tendency to enlargement of the palatine tonsils, which may spread to the ipsilateral soft palate, lingual palatine arch, pharyngeal palatine arch, and the uvula will push to the healthy side. Parapharyngeal space due to its special anatomical location, it is located in the pharyngeal cavity on the side of the upper pharyngeal retractor muscle and pterygoid muscle and the parotid deep lobe, and is divided into anterior and posterior space, the anterior space which contains pharyngeal ascending arteries and veins as well as lymphatic and cellular tissues, and the posterior space with the pterygomandibular, infratemporal, infratentorial, inframandibular, and retropharyngeal intervals, and if there is an odontogenic infection, it is likely to cause parapharyngeal space infections. Parapharyngeal space infection is also easily secondary to mumps, ear infections and deep upper cervical lymphadenitis. In addition to the clinical symptoms mentioned above, along with the development of the disease, the patient may also experience conscious pain in swallowing, difficulty in eating, restriction in opening the mouth, and in more serious cases, hoarseness, severe sepsis of lung infections, or thrombophlebitis of the internal jugular vein, etc. It is recommended to go to the appropriate department in the hospital promptly. It is recommended to go to the corresponding department of the hospital in time, standardized treatment under the guidance of the doctor, and improve the relevant examination.