A numb limb represents a possible problem with your spine; a herniated lumbar disc compresses and stimulates the adjacent nerve root, causing ischemia and hypoxia to produce inflammatory edema in the nerve root, resulting in pain in the corresponding innervation area. If treatment is not timely and the persistent compression factors are not lifted, the nerve root will atrophy, causing loss of sensory-motor function in the corresponding innervation area, resulting in sensory numbness in the leg and movement disorders. Even some patients do not have pain in the back and legs, but directly show sensory numbness or walking weakness in one or both legs. In the past two years, my neighbor had pain and swelling in one leg when walking, and every time she walked about 200 meters, she needed to sit down or squat down to rest before she could continue walking. In fact, this is due to a herniated disc that causes the volume of the spinal canal that houses the nerve to become smaller, resulting in congestion, edema, and inflammation of the nerve root under pressure. When walking, the venous plexus in the spinal canal is gradually expanded, resulting in a further reduction in the volume of the spinal canal, which increases the pressure on the nerve roots, resulting in increased leg numbness and swelling. However, when squatting or sitting down to rest for a moment, the volume of the spinal canal can be slightly expanded, and the symptoms can be quickly relieved or disappear, and the patient can continue to walk, and then after walking for a period of time, the above symptoms reappear. Because the claudication appears intermittently in this process, it is called intermittent claudication, which is one of the typical manifestations of spinal stenosis. If such symptoms occur, one should seek medical examination at the spine surgery department as soon as possible and treat accordingly.