The symptoms of right hand weakness in patients should be considered to be caused by three problems. The first aspect should be considered acute cerebrovascular disease, the second aspect should be considered occupying brain tumor disease, and the third aspect should be considered caused by cervical spondylosis, all three of which cause different symptoms of right hand weakness. If it is a sudden acute onset, it should be considered as cerebrovascular disease, such as cerebral infarction or cerebral hemorrhage or transient ischemic attack. If the symptoms of right hand weakness appear slowly and persist without relief, and progressively worsen, it may be caused by brain tumor, intracranial occupancy, and other diseases. Patients may also suffer from limb immobility, nausea, vomiting, or clumsy, slurred speech. If the patient develops it after a long period of poor posture with head down, then it is considered to be caused by cervical spondylosis. These conditions can be clarified by an MRI of the head or an MRI of the cervical spine.