Tonsillitis is inflammation of the tonsils. It is a type of pharyngitis  Symptoms may be sore throat, fever, extension of the tonsils, gulping problem, and large  lymph nodes around the neck. Tonsillitis is most common cause by a viral, with about 5% to 40% of cases brought about by a bacterial infection. At the point when activated by the bacterium group A streptococcus, it is referred  as strep throat. Once in a while microorganisms, for example, Neisseria gonorrhoeae, Corynebacterium diphtheriae, or Haemophilus influenzae might be the cause. Typically the infection is spread among individuals through the air. A scoring framework, for example, the Centor score, may help separate possible origins. Affirmation might be by a throat swab or fast strep test.