What causes back pain and leg pain?

Back pain and leg pain may be caused by lumbar disc herniation in most cases. Lumbar disc herniation is a protrusion of the lumbar disc caused by various reasons, which is then reflected to the waist through the sinovertebral nerve, causing waist pain. If the disc herniation compresses the nerve roots in the leg, it may cause radiating pain in the leg, and may also be accompanied by a feeling of numbness. If there is no obvious correlation between back pain and leg pain, pain in the waist may be lumbar disc herniation, lumbar muscle strain, fasciitis in the back, transverse process syndrome of the third lumbar vertebra, etc. Most of them are caused by bad living habits and working posture or excessive cold and soft bed. The leg pain may be muscle disease, tumor occupying disease, purulent infectious disease, vascular disease, peripheral nerve compression can also cause leg pain. Knee joint, hip joint synovitis and femoral head aseptic necrosis, as well as knee osteoarthritis can cause leg pain.