Trigger point injections are injections that are done in specific areas of certain muscles, which tend to be very painful and feel like tight knots in those specific muscles.  With the help of appropriate examination, the trigger points are identified and a thin needle is inserted into the trigger points to lyse the trigger points and then a mixture of local anesthetic and other medications are injected.  The injections result in immediate pain relief and recommendations generally are to go for appropriate massage or physical therapy stretching after the injections for maximum benefit.  Most patients tend to do fairly well with the above.