The etiology of tonsillitis mainly includes bacterial and viral. If the infection is bacterial, there may be a persistent fever, which may remain high without effective antibacterial medication, and after receiving effective treatment, the fever usually subsides in 2-3 days. Tonsillitis caused by viral infection is usually self-limiting, and the fever lasts 1-3 days before it recedes to normal on its own, accompanied by weakness, sore throat, poor circulation and other symptoms relief.