Seeking the cause of a headache is the first priority at the Headache Clinic — an important task considering the very wide variety of possible causes. While potentially serious, these causes are rarely encountered in routine clinical practice. Rocky Mountain Spotted Fever, Lyme disease, chronic mononucleosis, and other undetected systemic infections may present with headache. We also see headache with carbon monoxide, mold, and other environmental poisoning. >> read more >>