Sore Throat A sore throat is a common symptom that can happen from viruses, allergies, acid reflux, dry air, irritation, postnasal drip, or bacterial infections such as strep throat. Many sore throats improve with supportive care, but some need testing or treatment. It is important not to assume every sore throat needs antibiotics. Many sore throats are caused by viruses, and antibiotics do not treat viral infections. Common causes of sore throat A sore throat may be caused b