Low back pain is a chronic pain in the lower back and legs, a symptom common to many diseases, with complex etiology and high incidence. Most of them are the chronic extension of acute low back pain, with morphological changes and functional disorders of the lower back. It affects daily life and work. In order to relieve the pain of disease and protect the labor force. At home and abroad, we attach great importance to the health care and rehabilitation treatment of patients with low back pain. 1, common low back pain occurrence of the underlying disease classification 1, injury (acute lumbar sprain, chronic lumbar strain, supraspinous interspinous ligament injury, pear-shaped muscle injury syndrome, lumbar small joint synovial impingement, third lumbar transverse synovial syndrome, sacroiliac joint dysfunction) 2, degenerative changes (lumbar hypertrophic spondylitis, lumbar small joint degenerative degenerative arthritis, degenerative lumbar instability, lumbar intervertebral disc herniation) 3. Congenital (occult spina bifida, lumbosacral migrating spine, spinal isthmus bifida, lumbar spondylolisthesis, lumbar spinal stenosis) 4, inflammatory (ankylosing spondylitis, septic spondylitis, spondylolisthesis, lumbar tuberculosis, lumbar secondary adhesive arachnoiditis, proliferative spondylitis, lumbar dorsal fascial fibrositis, sacroiliac joint tuberculosis) 5, tumorigenic (lumbosacral metastatic tumor, neurosynovial tumor, cauda equina tumor) Second, the relationship between lumbar degeneration and age From the relationship between age and lumbar disc degeneration: 20 years old after the lumbar disc degeneration up to 20%; 30 years old after the lumbar disc degeneration up to 35%; 40 years old after the lumbar disc degeneration up to 40%; 60 years old after the lumbar disc degeneration up to 60%; scientific research reminds people, in ordinary work, life, to pay attention to the lumbar protection, try to slow down the lumbar disc degeneration. For example, when working and living, pay attention to the rest of the waist, should not stand for a long time, sit for a long time; spare time activities, to fully warm up before exercise, should not engage in too much such as large ball, long hiking, long-distance bicycle and other intense sports that tend to accelerate the degeneration of the lumbar disc. Patients who have the above mentioned underlying disease of lumbar pain should pay more attention. Third, the relationship between posture and lumbar disc pressure The relationship between posture and lumbar disc pressure can be seen: different postures have different pressure on the lumbar disc. Supine, the pressure on the lumbar disc is only 25%; side lying, the pressure on the lumbar disc is 75%; straight standing is 100%, upright leaning forward and correct sitting position, the pressure on the lumbar disc is 150%; seat leaning forward, the pressure on the lumbar disc is 180%, the arc of bicycle leaning forward is large, if the sitting position leans forward 30 to 40 degrees, it is close to the cycling Posture, it is up to 250% pressure on the lumbar intervertebral discs; coupled with cycling, double lower limb movement pull and instability, making cyclists more likely to produce back pain. Regular people riding bicycles will not have obvious lumbar pain performance, lumbar intervertebral disc under pressure suddenly large changes, and not necessarily pain; but, itself has lumbar degenerative changes, congenital lumbar spine deformity, lumbar spinal stenosis, lumbar intervertebral disc herniation disease patients, in the sudden increase in lumbar intervertebral disc pressure, it is easy to appear lumbar leg pain. Does that mean all can’t ride a bicycle? During the attack and treatment of lumbar pain, you should ride less or not. If you have degenerative changes in the lumbar spine, congenital lumbar deformity, lumbar spinal stenosis, lumbar disc herniation, you should alternate between bicycles, walking and public transportation, and after a period of adaptation, all aspects of the situation are stable and the condition becomes better, you can still try to ride a bicycle. However, you need to exercise the lumbar muscles to enhance muscle strength, especially swimming, to increase the strength of the lumbar muscles and help stabilize the spine, so that there will be no back and leg pain.