Soreness and swelling of legs and feet may be caused by local trauma or strenuous exercise, and may also be caused by degenerative diseases of lumbar spine or diseases of legs themselves. 1. Local trauma: if the legs and feet are traumatized, damage to the local muscle ligaments and soft tissues, it is easy to appear the phenomenon of soreness and swelling. 2. Strenuous exercise: soreness of the legs and feet may also be caused by strenuous exercise, because strenuous exercise may make the leg muscles lactic acid buildup, resulting in symptoms of localized soreness. 3. Lumbar degenerative diseases: If there are lumbar degenerative diseases, such as lumbar spondylolisthesis, lumbar spinal stenosis, lumbar intervertebral disc herniation, it is easy to compress the local nerves, which will cause the symptoms of soreness and swelling of the legs and feet, and usually there is pain, numbness and weakness of the lower limbs. 4. Diseases of the legs themselves: If there are diseases in the legs themselves, such as leg soft tissue infection, tuberculosis, tumor or leg bone infection, tuberculosis, tumor, etc., in the early stage of the disease, there may also be soreness and distension of the legs and feet. Sore and swollen legs and feet need to actively go to the regular hospital, clear what causes, under the guidance of the doctor to adopt the appropriate solution, so as to avoid delaying the condition.