Walking a lot of back pain and swelling may be a normal phenomenon caused by the increase of lactic acid in the lumbar region, or the patient himself suffers from lumbar muscle strain, lumbar intervertebral disc herniation and other diseases, as well as lumbar dorsal musculoskeletal fasciitis and other diseases. 1. Increase in lactic acid: If the patient does not exercise for a long time, walking more than once in a while will lead to an increase in lactic acid in the lumbar region, which will lead to the symptoms of lumbar soreness and swelling, which is a normal physiological phenomenon. 2. Lumbar muscle strain: lumbar muscle strain is due to the lumbar muscles, fascia and other injuries caused by the patient’s main symptoms for the lumbar pain, swelling, etc., there is relief after rest. If the patient himself suffers from lumbar muscle strain, it will lead to lumbar pain and swelling after walking more. 3. Lumbar disc herniation: Lumbar disc herniation is mainly caused by degeneration of the intervertebral discs, and the patient will have lumbar pain, numbness of the lower limbs, lower limb weakness, etc., which will also lead to the symptoms of lumbar soreness and distension after walking a lot. 4. Other: lumbar dorsal myofasciitis, lumbar spondylolisthesis and other diseases can also lead to the performance of the back pain and swelling after walking more. When patients have the symptom of back pain after walking more, it may be caused by the increase of lactic acid, which does not need treatment. If it is caused by diseases, patients should seek medical treatment in time and follow the doctor’s instructions.