The causes of weak hands mainly include cervical spondylosis, stroke and intracranial space-occupying lesions. 1. Cervical spondylosis: especially nerve root cervical spondylosis and spinal cord cervical spondylosis, with the further aggravation of cervical spondylosis, the nerve root or spinal cord will be obviously compressed, which often leads to the phenomenon of weak hands. 2. Stroke: including cerebral infarction and cerebral hemorrhage, after ischemia, hypoxia and necrosis of brain tissues, the patient will have symptoms of hand weakness and numbness, dizziness and headache. When the scope of the lesion is large, it will also lead to sensory and motor dysfunction of one side of the limbs and confusion. 3. Intracranial space-occupying lesions: when intracranial space-occupying lesions such as brain cysts, brain abscesses, brain tumors, etc. occur in the skull, with the further expansion of the scope of the lesion and the surrounding edema, the symptom of hand weakness will occur when the brain tissues that dominate the hand are compressed. At the same time, patients may experience headache, vomiting, hemiparesis of one side of the limb, epilepsy, and varying degrees of change in consciousness. Weakness of the hands can also be caused by other reasons. When the symptoms of lack of strength and weakness in the hands appear, it is necessary to pay attention to it. It is recommended to go to the neurology department of a public hospital, and according to the results of the examination to determine the cause of the disease, and actively treat it.