Double calf weakness is common in middle-aged and elderly people, there are the following cases: First, common in lumbar spinal stenosis patients, various reasons such as disc herniation, lumbar spondylolisthesis, ligamentum flavum hypertrophy and so on lumbar spinal stenosis caused by compression of the dural sac, so that insufficient blood supply to the dural sac, there will be a lack of strength in the lower limbs, the patient manifested in the inability to walk a long distance, short-term walk for a period of time after the need to sit down and rest again! Walking. Secondly, it is common in patients with poor venous return or insufficient arterial blood supply to the lower limbs, such as patients with venous thrombosis, phlebitis and thromboembolic vasculitis, long-term insufficient blood supply to the lower limbs, patients show symptoms of muscle ischemia after a short-distance walk, and there are aching pains and fatigue. Thirdly, some patients with chronic diseases, such as renal insufficiency, endocrine diseases such as thyroid insufficiency, resulting in metabolic electrolyte disorders such as low potassium, low sodium, low potassium and low sodium can easily lead to limb swelling, edema and limb weakness.