As with many chronic pain disorders, IC and CP are poorly understood, and treatment is often not helpful. The goal of this study is to better understand how pain is felt in people with IC or CP. The MAPP EP Study is an observational study that will enroll approximately 360 participants from 6 Discovery Sites and 3 Satellite Sites across the U.S. We will ask questions and gather information about the health and life of the participants for research purposes. No study treatment or interventions will be given to participants in MAPP. We hope that this study will lead to improvement in the treatment of IC and CP.