The clinical symptoms of sudden weakness in the hand first depend on whether the weakness occurs unilaterally or bilaterally. If the weakness occurs unilaterally, it is important to consider whether it is caused by cerebrovascular disease. If hand weakness occurs, it may also be caused by cervical spondylosis, spinal cord tumor and other diseases. Therefore, if such symptoms appear suddenly, it is best to visit the neurology department of the hospital in time to clarify the cause by measuring blood pressure and, if necessary, doing tests such as cranial CT or magnetic resonance. All in all, the appearance of such symptoms requires great attention.