A sore throat is a common illness symptom that many people experience, but there are various different conditions that can cause a sore throat. One of the most common causes of a sore throat is strep throat. Strep throat is a bacterial infection caused by Group A Streptococcus. However, not all sore throats are caused by strep throat. Other illnesses including viral infections, allergies, or environmental irritants can also lead to a sore throat. Keep ...