Does tonsillitis ever spread?

Tonsillitis spread. Yes, tonsil infections can "spread" to include pus accumulation in the areas next to the tonsils called the peritonsillar space to cause a peritonsillar abscess. Lymph nodes in the neck can get infected as well. Untreated tonsillitis has the potential to lead to blood poisoning or sepsis. Streptococcal tonsillitis can be complicated by inflammation of the kidneys.
Occasionally. Strep tonsillitis is the usual culprit and the strep organisms can release toxins in the blood causing a rash, arthritis, heart disease and other serious problems rarely!