Subsequently, this can lead to deformation. And in the first place soft periarticular tissues will suffer. Their inflammation can be associated with very unpleasant pain. Of course, the pain will accompany and changes in arched joints. Further, the deformed and "hungry" disc can not properly hold all the segments in place when moving in the spine. To stabilize the segments, the muscles will be forced to greatly contract and block the segment, protecting it from traumatic (dangerous) movements. The next stage in the development of the problem may be the appearance of a herniated intervertebral disc. This happens when the disc losing its properties continues to experience loads and its fibrous ring breaks out at the place of greatest stress. This fact again leads to pain, especially when the squeezed part of the disc begins to act on the spinal nerve (spine), this is the reason for the pain.
Over time, the injured disk completely loses its amortization qualities. Its fibrous ring is stretched, and it is no longer able to stably hold the vertebrae relatively to each other and "spring" them, hence the causes for the development of pain. The articular capsules of the arcuate joints, taking on an ever increasing load, also stretch over time, and the vertebrae become unstable. There is a so-called instability of the segment, and the spine (or rather, some part of it) becomes "loosened up". Another important factor and reasons for the occurrence of acute back pain and the initiation of traumatic processes in the spine is muscle spasm (often described in the literature as a myospastic syndrome). What happens with muscle spasm? First, the muscle gets tired. Secondly, she does not eat well. And this is not surprising, since the vessels are compressed by strained muscle tufts. And here the "hungry", "tired" and muscle-filled muscle products begin to "moan". The brain on the nervous path receives a signal from it and passes it to our perception. In the form of what? That's right, in the form of acute pain. And how does acute pain work? It causes an even more muscle spasm. That's the circle and closed. And I must say that such muscle spasms, especially deep and small muscles, can last a very long time. Spasm of the muscles can lead to squeezing the disc between the vertebrae and become a trigger mechanism for the development of a serious problem (for example, osteochondrosis). Muscle stress can also be a consequence of pathological changes in the structures of the spine, as the body will try to stabilize the damaged spine. Now we know how there is acute pain in the spine, the reasons for its detection.