We have divided this volume into four sections that cover the typical ground for head/face pain consultation: Section 1, Diagnostic Questions; Section 2, Treatment Questions; Section 3, Questions Related to Special Populations; and Section 4 Prognostic, Social, and Legal Issues. Diagnostic reasoning is presented along the lines of the International Classification of Headache Disorders, third edition (ICHD-III). Additionally, recommendations for adding or modifying new treatment modalities (pharmacologic and devices) that have been approved since publication of the first edition have been incorporated based on updates from the AHS consensus statement. A list of key clinical points again appears at the end of each case discussion, followed by a list of suggested articles or chapters for those interested in doing further reading on the subject.