What’s wrong with sitting for a while and not being able to straighten up?

Sitting for a while waist pain straight up, may be due to lumbar spine small joint dysfunction, lumbar disc protrusion, lumbar spine slipped and other lumbar spine disease.
1. Dysfunction of small joints of lumbar vertebrae: the posterior joints of lumbar vertebrae are composed of the lower articular process of the upper vertebrae and the upper articular process of the lower vertebrae, which is clinically known as small joints of lumbar vertebrae, also known as articular synovial joints, if there are actions such as twisting and turning when sitting, it may cause synovial embeddedness of the small joints or semi-dislocations of small joints, which will lead to severe lumbar pain, and it is not possible to straighten up the lumbar spine.
2. Lumbar spine disease: If the lumbar spine has degenerative lesions or the stability of the vertebral body decreases due to various reasons, the soft tissues around the vertebral body may be congested, edema or directly on the nerve compression. When sitting due to the vertebral pressure is relatively large, may also appear back pain straight up symptoms, common diseases such as lumbar disc herniation, lumbar spondylolisthesis, and so on.
Sitting for a while back pain straight up may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.