The purpose of this study is to allow for the deep, broad, and targeted phenotyping of persons with pain disorders and healthy volunteers. This protocol will enable NCCIH investigators to describe the clinical aspects of pain disorders, collect scientific measurements for the purpose of making deep phenotypic descriptions, and use the collected data to perform descriptive analyses of pain disorders. The study will also facilitate obtaining information relevant to determining if a person is potentially eligible to participate in other research protocols at NIH, in particular those of the Laboratory of Clinical Investigation (LCI) at the National Center for Complementary and Integrative Health (NCCIH). The specific goals of this protocol are the following: