Purpose of Review <p> Headache and functional neurologic disorders (FND) are the most diagnosed neurologic disorders, yet their relationship has not been comprehensively detailed.</p> Recent Findings <p> Understandings of migraine and FND have each progressed tremendously. Headache may be the most common neurologic comorbidity in FND. Migraine may be identified as a predisposing factor and predate FND up to ten years. Schemas have been proposed to explain potential relationship and shared pathophysiologic mechanisms; the disorders share multiple comorbidities. Headache may contribute to disability in FND. Treatment of migraine may improve functional symptoms; both entities respond to multidisciplinary approaches.</p> Summary <p> Migraine and FND commonly coexist, contributing to overall disability and decreased quality of life (QOL). Pathophysiologic interactions may impact management and outcomes. Headache history should be obtained in FND patients; headache when present should be treated appropriately. Future research should evaluate FND in cohorts of headache patients and if headache treatment could improve symptoms and QOL for specific FND phenotypes.</p>