Thickening of the posterior longitudinal ligament does not usually heal on its own. The posterior longitudinal ligament, located behind the vertebrae in the spinal canal, is tough connective tissue. It restricts excessive forward flexion of the spine and prevents discs from herniating backwards. Thickening of the posterior longitudinal ligament is often caused by strain and frequent activity, and sometimes ossification of the posterior longitudinal ligament occurs. Thickening of the posterior longitudinal ligament causes the anterior and posterior diameters of the spinal canal to narrow. This causes compression of the structures in the spinal canal, resulting in symptoms. For example, a thick layer of scale in the water pipe can cause the water pipe to narrow. Thickening of the posterior longitudinal ligament can also cause narrowing of the spinal canal. If the thickening of the posterior longitudinal ligament is severe. It creates severe compression on the structures within the spinal canal and often needs to be managed with surgical treatment. Thickening of the posterior longitudinal ligament does not recover on its own. If the thickening of the posterior longitudinal ligament is combined with symptoms such as compression of the structures in the spinal canal, it is important to go to a regular hospital in time, and not to treat it on your own, so as not to delay the condition.