Did you know that a specific type of throat infection is extremely serious and requires immediate medical attention? Epiglottitis infects a portion of your voice box, called the larynx, and causes swelling that closes the airway. When should you suspect that you have it? When swallowing is extremely painful and causes drooling, when speech is muffled, and when breathing becomes difficult. Learn more about sore throats by clicking the link and visiting our library.