The main types are as follows: First, it is involved leg pain, mostly seen in the elderly, they do not have particularly serious pain and discomfort in the lower back, but only feel that the activity is not easy. The characteristic of leg pain is hidden pain and discomfort, light during the day and heavy at night, and the X-ray film only shows the growth of bone spurs of varying degrees; secondly, the arterial insufficiency of the lower limbs, this kind of low back pain is characterized by aggravation when walking, and quickly disappears after a few moments of rest; thirdly, the lower limb blood supply disorders, and the pattern of its pain is that it does not aggravate during the activities, nor alleviate after resting, and it is only relieved by changing the postures and positions frequently; fourthly, the spinal toughness of the old age, and the checkups It can be found that the activities of thoracic and lumbar spine in all directions cannot reach the normal range, and the muscles of lumbar back are stiff. Lumbar and leg pain and discomfort, but after resting, only feel relaxed; Fifth, degenerative spondylolisthesis, which is a disease of the elderly, the pain and discomfort of the waist and legs can only be relieved in a warm environment or hot compresses, rest and inactivity instead of aggravation. 1, resting pain and dynamic pain soft tissue damage outside the lumbar spinal canal due to muscle spasm, muscle contracture degeneration adhesion of pathological changes, if the body is in a long-term position, especially lying down, is bound to aggravate ischemic damage, ultimately leading to the exacerbation of aseptic inflammation of the soft tissue at the lesion. If appropriate activities or walking, so that the blood supply of the lumbar soft tissues to improve, the pain can be gradually relieved. The inflammatory response of the fatty connective tissue outside the dural sac and nerve root sheaths in the lumbar spinal canal can only be reduced by adopting a braked recumbent position (no longitudinal pressure on the spine). Any activity in the upright position can only exacerbate the aseptic inflammation of the soft tissues outside the nerve sheaths, as the protruding mesenchymal discs or thickened ligamentum flavum are irritants to the dural sacs and nerve roots. The more the movement the more the pain will be exacerbated, sometimes manifested as a sudden pain after the movement, and the pain is relieved only when lying down. 2, the effect of increased abdominal pressure on pain Intravertebral lesions due to increased cerebrospinal fluid pressure on the nerve roots or dura mater to produce direct pressure, when the nerve is in the state of irritation, such as straining to defecate, cough, sneeze, etc. exacerbate the pain. Wearing a waist corset to reduce the axial pressure on the lumbar spine will offset part of the increased abdominal pressure, thus relieving the resulting pain. Pain caused by soft tissue damage outside the spinal canal is less affected by changes in abdominal pressure. 3, daytime pain changes lumbar spinal canal soft tissue damage pain: morning lumbar and leg pain is obvious, and even in the early hours of the morning due to the pain of waking up and can not lie down, have to get up and activities to relieve pain, daytime general work and activities are not impeded. Lumbar spinal canal lesion pain: no pain or mild pain in the morning, after getting out of bed or afternoon or evening pain is most obvious, sitting position also makes the pain aggravate more quickly. 4, the nature of the lower extremity pain is different sciatica (involving pain or radiating pain) are derived from the spinal canal innervated by the spinal sinus nerve dura mater, the posterior longitudinal ligament, ligamentum flavum region caused by stimulation of involving pain, nerve root involvement resulting in radiating pain, or outside the spinal canal muscles, ligamentous damage due to the stimulation of the nerve trunk branch caused by radiating pain and its own damage to the region caused by involving pain. Intravertebral canal lesions appear mostly or only for a single segment, often involving the distal lower extremity neurosensory distribution area, pain and numbness coexist with a very high chance. Extra-vertebral soft tissue damage in the lower extremity radiating pain, but the distal lower extremity (foot) sensory deficit is rare. Clinically, the chance of involving pain is extremely high, and the site of lower extremity pain is fuzzy, conduction to the foot is uncommon, generally for the waist or buttocks to the lower extremities of the posterior lateral dispersion to the s socket. 5, the impact of lifting heavy objects when the abdominal pressure rises, especially in the waist when holding weight, chest and abdominal muscles strong contraction, can make the vertebral venous plexus within the venous pressure is extremely elevated, can increase the pressure of the affected dura mater and the nerve root and exacerbate the low back pain and lower limb pain. In a significant number of cases, the pain flares up due to lumbar weight-bearing in the chief complaint and is not easily relieved on its own. Although the soft tissue outside the spinal canal is also difficult to hold weight, but the degree of impact is small, generally after rest and braking pain can disappear naturally. 6, the evolution of the course of the characteristics of extra-vertebral tissue damage pain can be sudden onset, but generally in a short period of time can be relieved, and the intermittent period (relief of symptoms) is long, self-limiting obvious, generally do not need special treatment. Intravertebral lesions cause frequent sudden onset of low back pain, with intervals gradually becoming shorter as the number of episodes increases, and the episodes are long, usually requiring 2-6 weeks of specialized treatment before relief. The symptoms of low back and leg pain are recurrent if they are mild and severe. There is even no obvious cause, the frequency of attacks is getting higher and higher, and the interval period is shortened. Episodes from the beginning of self-relief to the inability to relieve, should be considered lumbar spinal canal inside and outside the mixed type of lesions caused by. It suggests that two different types of damage lead to the destabilization of the lumbar spine, which is also a manifestation of the severity of the disease. 7. Damage to cauda equina is a characteristic of intravertebral canal lesions. Lumbar spinal stenosis, huge disc herniation or intravertebral canal tumor can lead to compressive damage of cauda equina. The onset of ischemic limited arachnoiditis, functional damage, clinical manifestations of atypical lower extremity paresthesia or swelling pain, almost all patients with intermittent claudication, so that the cycle of symptoms. In severe cauda equina damage, a wrenching foot occurs when taking steps or going up and down steps. Vesicorectal dysfunction, from urinary weakness, constipation, and then progress to incontinence, the patient perineum and perianal sensation diminished or disappeared.