1, intermittent claudication: when the patient walks a certain distance (several meters – hundreds of meters), there is a side and bilateral back pain, leg pain, lower limb numbness, weakness and thus limping, when squatting or sitting down after a few minutes of rest there can continue to walk, but the distance is shorter than normal people. Because there are intermittent periods, so the name intermittent claudication. Severe cases cannot walk on the ground. 2.Lumbar posterior extension restriction and pain: When the lumbar spine is changed from neutral to posterior extension position, the small joint capsule and the yellow ligament behind the spinal canal are squeezed into the spinal canal, and the length of the spinal canal is shortened by 2.2mm, and the intervertebral foramen is narrowed, resulting in a sharp increase in pressure in the canal cavity, and various symptoms appear as a result. 3. Inconsistency between subjective description and objective examination: early in the course of the disease, the volume of the spinal canal and nerve root canal is reduced to the normal low limit due to spinal stenosis, and when the patient is in various forced positions that increase the pressure in the spinal canal, there are many subjective descriptions. And the objective examination is often negative because of the short rest at the time of consultation. 4.In addition to the three major symptoms mentioned above, the following clinical symptoms and signs can also be seen: (1)Lumbar symptoms: mainly manifested as lumbar pain, weakness and easy fatigue, but negative flexion neck test. (2) Lower limb radicular symptoms: mostly bilateral, which can be similar to lumbar disc herniation, especially when walking, but relieved or disappeared after rest. 5. Chronic course of recurrent attacks. As soon as the above symptoms appear, you should go to the hospital for professional examination to avoid missing the best treatment time.