The pain on both sides of the back is caused by the following factors: 1. If the pain is on the back side of the waist, near the lumbar 3 transverse process, which is usually referred to as the kidney point, most of them are L3 transverse process syndrome, which occurs mainly because of the inflammation of the bursa on the lumbar 3 transverse process after sitting for a long time. 2. The pain on both sides of the waist is most likely due to lumbar fasciitis, and there are erector spinae muscles on both sides of the waist, and the surface of the erector spinae muscles is inflamed. The white fascia is inflamed by cold, strain, and trauma, and after inflammation, both sides of the waist will be painful, painful, stiff, and inflexible. 3. If the pain occurs in the lumbar 4-5 and lumbar 5 sacral 1 vertebrae, a CT or MRI should be done to rule out a lumbar disc herniation.