Saltwater gargling

Soreness in the throat can cause throat pain. Soreness of throat is generally due to the infection of the bacterium called Streptococcus. So it is called strep throat. A strep throat is usually inflamed due to bacteria making widespread damage on our soft tissues or mucosa.

These inflammations (known as edemas) are usually filled with water. When we gargle with warm salt water that is saltier than our body fluids (hypertonic solution), through osmosis the salt draws out the edema fluid.

The principle behind it is that if a porous partition separates dilute and concentrated solutions then the dilute solution permeates through the porous partition into the concentrated solution.