Does Salt on a Wound Cause Pain? Understanding the Science

Putting salt on a wound is generally considered painful.

When salt comes into contact with an open wound, it causes a process called osmosis. During osmosis, water molecules from the wound move towards the area of higher concentration of salt (the salt) in an effort to balance out the concentrations. This movement of water out of the wound causes the cells in the area to shrink and die, leading to pain and discomfort.

Additionally, salt can act as an irritant to the sensitive tissues in the wound, causing further inflammation and pain. The pain caused by salt on a wound can vary in intensity depending on the concentration of the salt and the size of the wound.