Thank you for writing.
You will need to ask your doctor exactly why this is being performed. But it may be to see if emporal arteritis is the cause of these headaches. This is a condition of inflammation of the arteries. It affects the head, neck, upper body, and arms. The temporal artery is most often affected. It runs over the temple, to the outside of the eye. In extreme or untreated cases, this condition can lead to blindness or strokes. Two other terms often associated with this condition include:
Giant cell arteritis (GCA)—another name for temporal arteritis
Vasculitis—a general term for swelling or inflammation of blood vessels
Please ask your doctor for details about why this is being performed and how it will be done.