What is it?
Muscles sometimes develop knotted areas called trigger points. These trigger points are highly sensitive and can be painful when touched. They are also often the cause of referred pain (or pain that affects another part of the body). Clinicians push thin solid needles through the skin into trigger points. The needles are used to stimulate the tissue, not to inject medication.
Experts believe that placing small needles into the TPs can cause a twitch response. This reaction helps reverse both the chemical changes and some of the nerve dysfunction that may be causing the pain. The muscle cramps when the needle first enters the painful area and then slowly starts to relax with each entry and exit of the needle.