Walking leg soreness may be a normal physiological phenomenon, or it may be related to pathological causes, such as varicose veins of the lower limbs, lumbar spine disease, joint disease and other causes. 1. Physiological phenomenon: if you walk for too long, the muscles of the calf or thigh will contract repeatedly, which will easily cause muscle fatigue, and the leg muscles will accumulate acidic products such as lactic acid and carbon dioxide after walking for a long period of time, which will cause leg soreness. 2. Varicose veins of the lower limbs: if the patient’s venous blood reflux is impaired, the venous blood can not maintain normal operation, which leads to varicose veins of the lower limbs, resulting in symptoms such as leg soreness and pain. 3. Lumbar spine disease: If the patient has lumbar spinal stenosis or lumbar spine slipped, lumbar disc herniation, etc., it is easy to affect the nerve root responsible for innervating the lower limbs to be compressed and edematous, and in serious cases, it will also cause the nerve conduction to be impaired, which will lead to lumbar pain and walking discomfort. 4. Joint diseases: when suffering from rheumatoid arthritis, osteoarthritis or joint cavity effusion and other diseases, walking for too long will stimulate the inflammation, thus triggering leg pain and swelling. If walking leg soreness after resting for a period of time is still not relieved, or suspected to be related to pathological causes, or also accompanied by other discomforts, we should go to the hospital in time for examination, to determine whether it is caused by diseases, and according to the specific causes of targeted treatment.