A back muscle spasm is an extremely common cause of acute and chronic neck pain and back pain. Spasms often present as painful “knots” within the muscles. The muscles of the neck and back can be so uncomfortable that they also restrict range of motion.
A trigger point is a particulary sensitive area in the muscle tissue (myofascial) that becomes painful when pressed or squeezed.
The injections loosen the knots built up in the muscle tissue that are the cause (or one of the causes) of pain. By allowing the area to relax and release tension, the tearing and stretching of the tissue can subside.
A common use for trigger point injections is to reduce or eliminate back spasms.
Once you have decided to have the trigger point injection, the following events take place: