The patient’s lack of strength in the hand should be clarified by combining the causes of the onset of the disease as well as doing relevant examinations. Firstly, if one side of the hand has no strength all of a sudden, it should be considered that it is caused by acute cerebrovascular disease, such as cerebral infarction, cerebral hemorrhage, transient ischemic attack, and it needs to be actively treated. Secondly, if both hands have no strength, it may be caused by electrolyte disorders, such as the existence of low blood potassium or low blood sodium will appear in both hands have no strength, and even the performance of body weakness. Thirdly, if the lack of strength in one side of the hand does not occur suddenly, it should be considered that it may be caused by peripheral nerve injury, and it is necessary to pay attention to whether the patient has ulnar nerve injury or carpal tunnel syndrome and other reasons, resulting in nerve compression caused by the lack of strength in the hand, and consult orthopedics for examination.