Trigger point injections can be an extremely effective treatment for musculoskeletal pain. Trigger point injections involve injecting a local anesthetic, such as lidocaine, into a trigger point. Trigger points are taut bands of muscle, often referred to as a "knot."  Addressing these areas through trigger point injections can help reduce chronic muscle pain, and relieve conditions such as tension headaches, fibromyalgia and myofascial pain syndrome. Common treatment areas include the neck, back, arms and legs.