Pharyngitis is the swelling and inflammation of the pharynx. The pharynx is the back of the throat, including the back of the tongue. Tonsillopharyngitis is the swelling of the pharynx and the tonsils. The tonsils are soft tissue that make up part of the throat's immune defenses. Both pharyngitis and tonsillopharyngitis are commonly called a sore throat. Sore throats can easily be treated. If you have a sore throat for more than two days, contact your doctor.