It causes the generation of thermal and non-thermal which aids in healing. It penetrates tissues to a different depth. The ease of passage is known as Impedance. The impedance is enhanced with the use of Coupling media i.e. Oils/ Creams/ Gels. Most commonly used medium is anti-inflammatory gel.
Just like every other symptom throat pain could be a manifestation of very small problem or be a part of bigger problem. How to differentiate throat pain??