Sudden hand weakness is usually caused by the following diseases: 1. ionic disorders, sudden onset of hypokalemia or hypomagnesemia, sudden hand weakness. 2. sudden hand weakness is also related to cerebrovascular diseases, sudden onset of cerebrovascular insufficiency, TIA attack, acute cerebral embolism, acute cerebral infarction, acute cerebral hemorrhage, sudden hand weakness. 3. sudden hand weakness is also related to cervical spondylosis. The sudden onset of hand weakness and weakness is also associated with cervical spondylosis, where the cervical spine compresses the carotid artery and the blood vessels and nerves in the neck. 4. Common endocrine metabolic diseases, such as hypoglycemia, may cause sudden onset of hand weakness and weakness, accompanied by clinical symptoms and manifestations of dizziness, headache, general weakness, cold sweat, and weak sweat. 5.