The possible causes of cold right arm include poor local blood circulation, nerve damage and cervical spondylosis. 1. Poor local blood circulation: It may be due to poor sleeping or sitting posture, causing the blood vessels in the right arm to be compressed for a long time, resulting in poor blood circulation, which leads to the symptom of coldness. It may also be due to frostbite on the right arm, which slows down blood circulation and causes the symptom of coldness in the right arm. 2. Nerve damage: It may be caused by damage to the peripheral nerves of the right arm, such as knife cuts on the right arm of the patient, causing damage to the nerves, causing nerve damage, which leads to the symptoms of coldness. 3. Cervical spondylosis: It may be due to cervical spondylosis compressing the nerves, resulting in damage to the nerves in the right arm, which produces the phenomenon of coldness. There may be other reasons for the coldness of the right arm, it is recommended to go to the regular hospital in a timely manner to improve the relevant examination, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment or treatment.