The causes of right arm numbness include physiological factors and disease factors. After the arm is compressed, decompression can make the numbness symptoms recover; cervical spondylosis can be oral methylcobalamin and other nutritional nerves; intracranial diseases, such as lacunar cerebral infarction oral aspirin and other drugs such as secondary prevention. 1. Physiological factors: When the right arm is compressed, local ischemia and hypoxia will cause numbness. It will return to normal after relieving the compression and usually does not need special treatment. 2. Cervical spondylosis: when the cervical neuropathy is compressed, numbness of the right arm may occur. Methylcobalamin and vitamin B1 can be taken orally as prescribed by the doctor to nourish the nerves. Other treatments include traction therapy and surgery, which can improve the symptoms of numbness. 3. Intracranial diseases: Intracranial diseases such as lacunar cerebral infarction and intracranial tumor may cause numbness of the right arm. For cavernous cerebral infarction, oral aspirin and clopidogrel can be taken to improve blood viscosity, and atorvastatin can be taken to lower blood lipid, which can assist the treatment. Intracranial tumors are usually considered for surgical treatment to remove the lesion to relieve symptoms. There are many symptoms that cause numbness in the right arm, and it is recommended that patients exclude physiological factors and then actively seek medical attention to clarify the cause and target treatment under the guidance of the doctor.