Weakness of legs and feet in elderly patients in their 80s can be improved by the following methods because the causes are different and the treatment is also different: First, if the symptoms of weakness of legs and feet are caused by lumbar disc herniation, lumbar spinal stenosis and other diseases, you can take appropriate bed rest, perform ultrashort wave therapy and microwave therapy on the lumbar region, and apply topical compound Nanxing pain relief cream and flurbiprofen gel paste. Through the above active treatment, it can make the lumbar nerve edema and inflammatory reaction subside and restore the leg muscle strength. Secondly, if the leg and foot weakness is caused by lower limb muscle atrophy, patients who can tolerate it, proper muscle training of resistance and auxiliary elastic band for calf flexion and extension activities can exercise calf muscles and thigh muscles to enhance lower limb muscle strength. After 3-6 months of exercise, the patient will obtain significant improvement in the symptoms of leg and foot weakness. Therefore, elderly patients with weakness in legs and feet can obtain some degree of improvement after conservative treatment.