Tonsils unilateral third-degree enlargement is considered to be caused by inflammatory stimulation. Tonsil enlargement is divided into one degree, two degrees and three degrees, if it is the third degree of enlargement, it is considered to be more serious, and some diseases are related to the recurrence of acute and chronic nasopharyngitis, and may also be the inflammation of neighboring organs involved in the nasopharynx, so that the tonsil tissue hyperplasia. The third degree enlargement of tonsils is common in children’s groups, and children’s resistance and immunity is relatively low, the pathogen through droplets or direct contact and other transmission channels, usually hidden in the tonsil fossa, when the body’s immunity is lowered, the pathogen will rapidly multiply to cause some symptoms. The third degree enlargement of tonsils will lead to open-mouth breathing, sleep snoring and other symptoms, some also manifested in poor swallowing, and serious localized pus. There may be other reasons for the third degree enlargement of tonsils, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.