Patients with lumbar spinal stenosis do not need surgery at the onset of the disease, but some patients will be relieved with a little rest. This is why when you go to the hospital with back pain, your doctor will explain that you should reduce your activities and rest in bed, which is a good idea. Spinal stenosis: Why is this? Because the normal lumbar spinal canal, the cauda equina nerve accounts for about 21%, the rest of the space occupied by cerebrospinal fluid, the normal lumbar spinal gap is wide in the front and narrow in the back. Lumbar spinal stenosis causes compression of the cauda equina and nerve roots, neurotropism, and venous stasis between the narrowed segments. At this time, if the movement, such as lumbar spine posterior extension, the volume of the spinal canal is further reduced, the blood flow is slow, and the blood supply and oxygen demand of the nerve increases during the movement, which will aggravate the ischemia and hypoxia of the cauda equina and nerve roots that are already compressed. At the same time, when standing or walking, in order to adapt to the body load, the lower limbs straighten to drive the lumbaris major muscle tension, thus increasing the lumbar curve. In bed, the lower extremities do not carry the body’s gravity, and the psoas major muscle is also in a relaxed condition. The lumbar curve is smaller than in the standing position, the volume of the spinal canal is relatively increased, the pressure in the spinal canal is also reduced, the local venous return is improved, the aseptic inflammatory reaction (congestion and edema) subsides, and the pressure on the cauda equina and nerve roots is relieved. Spinal stenosis: After spinal stenosis surgery and simultaneous cessation of activities, the blood supply and oxygen demand of the nerves are reduced, and the muscles of the low back are relaxed after bed rest, so generally the symptoms will be reduced and relieved after bed rest. However, if the pain occurs frequently and has affected working life, and bed rest relief has failed, you should go to the spinal surgery department for systematic treatment as soon as possible.