Move the left foot back pain, the possible causes are lumbar myofibrositis, lumbar muscle strain, lumbar intervertebral disc herniation and so on. 1. lumbar muscle fibrous tissue inflammation: may be due to cold, wet environment, chronic strain and make the lumbar muscle tissue edema, oozing and fibrous changes, resulting in lumbar muscle fibrous tissue inflammation, mainly manifested in the lumbar back pain pain, both sides of the lumbar muscle is more obvious. When moving the left foot, lumbar pain symptoms. 2. Lumbar muscle strain: lumbar muscle strain is mostly due to the accumulation of lumbar muscles, ligaments and other soft tissues or chronic injury, or acute lumbar sprain caused by aseptic inflammation. The main symptom is lumbar pain, which increases when standing or twisting. Therefore, the phenomenon of moving the left foot back pain may occur. 3. Lumbar disc herniation: it may be caused by the degeneration of the intervertebral disc, heavy physical labor, acute trauma, long-term work, etc., resulting in lumbar disc herniation, and the main symptoms are lumbago, sciatica, etc., and there may be the phenomenon of back pain when moving the left foot. Move left foot back pain may also have other reasons, it is recommended to go to the regular hospital in a timely manner to improve the relevant examination, clear the cause of the disease, under the guidance of the doctor to carry out targeted treatment or treatment.