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Evaluating a headache During his initial evaluation, Vijayan reviews how the patient's headaches began and how they progressed. He also asks the patient about the frequency, severity and unique features of the headaches. Vijayan performs a neurological examination and other tests to determine if any other illness could be causing the headaches. Some patients are nervous about these tests, fearing that severe headaches are caused by a brain tumor. Usually, if a person has a brain tumor, the headaches will be of recent onset, and the patient will have other symptoms, such as seizures, loss of memory, and numbness or weakness on one side.