How does it work?
Most pain is caused by noxious stimulus of nerve endings called nociceptors. Stimulation of these nociceptors results in a pain response from the brain and a protective reaction / muscle spasm. This is designed to limit movement of the injured area allowing healing to take place.
Dry needling works to relieve these muscle spasms by creating a response within the muscle by causing a physical change by way of muscle contraction around the needle, a chemical change byway of causing a low-grade inflammatory response and a neurological response by changing the electrical impulse in the area. This all collectively makes the muscle relax and helps with pain.