When a spinal segment is injured by an accident or repeated micro traumas such as poor posture, it becomes locked or misaligned. This event leads to inflammation around the joint, muscle spasm, and/or joint fiber sprains. This then leads to irritation of nerve fibers around the joint. These fibers control the function of the muscle and other glands or organs in the area, as well as perceive pain. This leads to the focal pain, radiating pain, or the systemic symptoms you are experiencing.