Pharyngitis [ˌfarɪnˈdʒʌɪtɪs] is an inflammation of the throat or pharynx. In most cases it is painful, and thus is often referred to as a sore throat. Inflammation of the tonsils and/or larynx ( may occur simultaneously, which can make eating difficult or painful.
Most cases are caused by viral infections (40%-60%), with the remainder caused by bacterial infections, fungal infections, or irritants such as pollutants or chemical substances.
Source: abang Wiki