Causes of a sore throat on one side includes the flu ... Tonsillitis Tonsillitis occurs when your tonsils become inflamed and swollen and is typically more common in children than in adults.
A peritonsillar abscess is an area of pus-filled tissue at the back of the mouth, next to one of the tonsils. The abscess can be very painful and make it hard to open the mouth. It can also cause ...