There are many causes of numbness and weakness of the feet, which should be analyzed in conjunction with the patient’s medical history, age, and a variety of medical conditions.Numbness and weakness of the feet can be considered as peripheral nerve injury. For example, there is no history of local trauma, or a history of over-exertion and long-term compression. It can be considered whether there is a muscle disease, or whether the patient is an ionic disorder low potassium, can appear at the neuromuscular junction of the muscle disease, resulting in weakness and numbness of the feet. Other than that, if the patient is elderly, the possibility of cerebrovascular disease can not be ruled out, that is, the said cerebral hemorrhage or cerebral thrombosis. It is recommended that the patient go to the hospital for nuclear magnetic head, blood ionization examination, and electromyography examination to clarify the cause of the disease. It can be categorized into central brain disease, peripheral nerve injury, or numbness and weakness caused by abnormal ionic disorders in the blood. There are different treatments for different diseases, and it is recommended that patients make a clear diagnosis as soon as possible.