Avoiding irritation of the throat can sometimes prevent a sore throat.
Untreated strep throat may lead to rheumatic fever. Rheumatic fever is an inflammation of the joints and the heart resulting from a streptococcal infection. Some types of sore throat may cause difficulty breathing due to swelling, or the formation of abscesses.
A sore throat caused by Group A streptococcus is contagious. A sore throat caused by a sexually transmitted disease also contagious.