Causes

• Colds (URIs): Most sore throats are part of a cold.  In fact, a sore throat may be the only symptom for the first 24 hours. 
• Viral pharyngitis: Some viruses cause a sore throat without nasal symptoms. 
• Strep pharyngitis: Group A Strep is the most common bacterial cause. It accounts for 20% of persistent sore throats. Only these need an antibiotic.