The location of the tonsils in human anatomy is between the palatopharyngeal arch and the palatoglossal arch, within what is known as the tonsillar fossa. The tonsils are pink, lumpy, symmetrically distributed balls of flesh that can be observed in the oropharynx with the mouth open. The tonsils, or palatine tonsils, are important lymphoid tissues in the human body, usually flat and ovoid in shape, and can be found on the outer as well as the inner surface, and are mainly composed of lymphoid tissue. It is an important part of the pharyngeal lymphatic ring. Tonsils will be physiologically enlarged in childhood, and usually shrink gradually after the age of 10. There are some pathogens in the pharynx and crypts of normal people, and when the immune function is lowered, the pathogenic microorganisms will multiply in the pharynx, which will lead to tonsillitis. Tonsillitis can be triggered by the proliferation of pathogenic microorganisms in the pharynx and crypts when the immune function is lowered.