Most headaches can be diagnosed by a medical history and physical exam. Rarely, to rule out other causes of headaches such as an aneurysm, tumor, or structural abnormality, a doctor may call for vision tests, X-rays, a CT scan, MRI, a lumbar puncture, or an EEG.
You have a sudden, severe headache. It is the “worst headache of your life.” Or you have had a seizure, are confused, have passed out, or have a change in behavior. These may be signs of a stroke. Call 911.
You have a severe headache with vomiting, limb weakness, double vision, slurred speech, or difficulty swallowing. This may signal a stroke, cerebral hemorrhage, or an aneurysm. Call 911. Get medical help now.