Some auras have a musculo-skeletal origin. For example, some neck issue irritates a nerve or alters the pressure in a blood vessel, which in turn affects the op

Some auras have a musculo-skeletal origin. For example, some neck issue irritates a nerve or alters the pressure in a blood vessel, which in turn affects the optic nerve. I have suffered them myself, and they always came in a sequence: arm pain, neck pain, headache and aura. Finally, I'd release tension in my neck and it'd be gone. My doctor confirmed injuries in cervical discs also seem to be causally linked to auras, but there might be other causes as well.