Tonsillitis
Tonsillitis is inflammation of the tonsils. It's usually caused by a viral infection or, less commonly, a bacterial infection.
The main symptom of tonsillitis is a sore throat. Your tonsils will be red and swollen, and your throat may be very painful, making swallowing difficult.
Most cases of tonsillitis are caused by viral infections. It can also be caused by bacterial infections, particularly group A streptococcus bacteria.
There's no specific treatment for tonsillitis and most cases get better within a week without treatment.
Tessa Hughes, from Brixton in London, had a tonsillectomy when she was 15, after having chronic tonsillitis.