Headache and arm pain may be a sign of migraine, cervical spondylosis, cerebrovascular disease and so on. 1. Migraine: When migraine attacks, not only can it show symptoms such as headache, nausea, vomiting, stomach upset, dizziness, etc., but also fever, limb pain, etc., then the symptoms of headache and arm pain will appear. 2. Cervical spondylosis: due to cervical disc herniation, it can compress the spinal cord and nerve roots, leading to the emergence of nerve root radiating pain. In addition to the symptoms of dizziness and numbness of the limbs, the symptoms of headache and arm pain will occur. 3. Cerebrovascular disease: for example, intracranial blood vessel stenosis or blockage, which can easily lead to ischemia and hypoxia in the brain, resulting in cerebral vasospasm, which can lead to the symptoms of headache and arm pain. At the same time, there can also be numbness of the limbs, slurred speech and other symptoms. When the symptoms of headache and arm pain appear, it is recommended to go to the hospital as soon as possible, to clarify the cause of the disease, so as to facilitate the treatment of the cause, so as to avoid delaying the condition.