When you are under stress or your body faces a problem, one of its first reactions is a tightening in your muscles as a mechanism of defense. These areas, which are often referred to as “knots,” can develop for any number of reasons, from degenerative damage in your joints to stress. If they don't resolve in a timely manner, these knots can irritate your nerves, and prevent your natural resources from flowing freely, essentially forming a block and causing chronic pain. 

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A trigger point injection can help soothe myofascial pain, especially in your neck, shoulder, arms, legs, and lower back. Often, trigger point injections contain lidocaine (Xylocaine) or Bupivacaine (Marcaine). Trigger point injections can also have corticosteroids. The lidocaine, which is a local anesthetic, starts working immediately to quiet the irritated nerves in the area, while the steroids tackle the inflammation. Together, they relax your muscles and offer pain relief.