There are many causes of weakness of hands, and the common causes are as follows:1. Cervical spine disease compresses the arm nerves, which can cause numbness and weakness of hands.2. Hypokalemia is caused by lowering of potassium ions in the blood, which can cause weakness of limbs, and severe limbs can not be lifted away from the bed, and respiratory paralysis occurs, which can be examined by checking the electrolytes.3. Cerebrovascular diseases include cerebral infarction and cerebral hemorrhage, and it is best to measure blood pressure and check head CT if it is a middle-aged or elderly person who experiences Dizziness, numbness of the limbs, it is best to measure blood pressure, check the cranial CT. 4, Parkinson’s syndrome, most commonly seen in the elderly, common clinical symptoms include tremor, limb weakness, memory loss, slow reaction, etc., myasthenia gravis, over-exertion can be the above symptoms, it is best to go to the hospital as early as possible to confirm the diagnosis.