Heavy and stiff legs are considered to be related to lumbar spine diseases, rheumatoid arthritis, varicose veins of the lower limbs and other causes. 1. Lumbar spine disease: For example, lumbar disc herniation can compress the central canal spinal cord or nerve roots, resulting in numbness, weakness, pain and other symptoms in the lower limbs. Or when lumbar spinal stenosis occurs, it can also cause heavy and stiff legs. Especially after walking for a long distance, the feeling of heaviness and discomfort in both lower limbs is more intense, but the symptoms will improve after rest. 2. Rheumatoid arthritis: an autoimmune disease. When rheumatoid arthritis occurs, it will lead to aseptic inflammation of the joints and symptoms such as redness, swelling, edema and pain. At the onset of the disease, there will be heavy legs, stiffness, and even inability to act. 3. Varicose veins of the lower limbs: the blood in the veins of the legs of the patient is stagnant, resulting in the blood not being able to flow back smoothly, or even reflux, the patient will also feel heavy legs. The poor return of blood leads to stagnation of body fluids in the soft tissues of the legs, causing swelling and heaviness of the legs. Cervical spondylosis, cerebrovascular disease can also be caused, it is recommended to pay attention to rest, pay attention to the legs to keep warm, avoid the legs cold. Serious cases should go to the hospital as soon as possible, identify the cause of the disease, targeted treatment.