Weakness of the feet may be related to overwork, herniated discs, vascular lesions, and muscle weakness. If the weakness occurs after long-distance running or mountain climbing and other intense exercise, it is physiological weakness of the feet, which is caused by excessive muscle fatigue. Generally, it can be relieved after proper rest. Lumbar disk herniation, spinal stenosis, lumbar spondylolisthesis and other lumbar diseases compress the spinal nerve roots, which can also cause the nerve innervation of the lower limbs to function abnormally, and there will be muscle weakness as well as leg pain and leg numbness and other symptoms, and severe muscle atrophy of the lower limbs. Lower extremity vascular disease such as lower extremity venous thrombosis, varicose veins, etc. will cause venous reflux obstruction, a large amount of venous blood stagnation will also appear the symptoms of foot weakness. Patients with myasthenia gravis may experience muscle weakness in the legs and the whole body in the later stages of the disease. Lower extremity joint diseases such as ischemic necrosis of the femoral head, osteoarthritis of the knee and other diseases may also cause weakness of the feet and legs in the later stages of the disease. Other diseases such as hypokalemia, hypotension, hypoglycemia, cerebral insufficiency of blood supply, insomnia, etc. can also cause symptoms of weak legs. If the symptoms of weak legs occur, it is recommended that the patient go to the hospital to improve the examination, under the guidance of the doctor regular treatment.