The numbness and weakness of the right hand can be seen in brachial plexus nerve injury, cervical spondylosis, cerebral hemorrhage, cerebral infarction and other diseases.1 Brachial plexus nerve injury has a clear history of trauma, most often caused by pulling the upper limb with force or injury during medical puncture. Patients may have numbness and weakness of the right hand, and serious patients may have atrophy of the large and small piriformis muscles and interphalangeal muscles.2. Cervical spondylosis is mostly seen in patients who have long time heavy physical labor or long time working at desk or driving, and patients are often accompanied by dizziness, discomfort of the back of the neck, and soreness of the shoulder, and they may have cervical spine MRI to further clarify the diagnosis.3. Cerebral hemorrhage and cerebral infarction are mostly seen in elderly patients who have hypertension, diabetes, hyperlipidemia, hyperlipidemia, and cerebral infarction. Cerebral hemorrhage and cerebral infarction are mostly seen in elderly patients, who usually have hypertension, diabetes mellitus, hyperlipidemia, hyperuricemia and other underlying diseases, often accompanied by symptoms such as crooked eyes and mouth, dizziness, headache, difficulty in swallowing, slurred speech and so on, and the diagnosis can be further clarified by cranial CT or magnetic resonance imaging examination of the head.