Special issue on pain and intellectual and developmental disabilitiesChildren with Intellectual and Developmental Disabilities (IDD) represent a diverse group with conditions that begin during the developmental period and are associated with physical, learning, language, behavioral, and/or intellectual-based impairments. These impairments also frequently impact day-to-day functioning, generally lasting throughout a person's lifetime. 1 Because of the work of pioneering researchers in the field, pain is now understood to be a common and complex occurrence for children with IDD. 2 Indeed, under certain circumstances and contrary to historical beliefs, children with IDD compared to typically developing peers may actually be more sensitive to pain 3 and demonstrate greater pain evoked potentials. 4 Children with IDD also undergo more frequent and more invasive painful medical events 5 and are more likely to experience chronic pain compared to typically developing peers. 6,7 Unfortunately, children with IDD are also more likely to have limitations in their ability to communicate about their pain effectively, which impacts their ability to effectively utilize self-report pain assessment measures or advocate for their own pain relief. 8 Caregivers may be apt to underestimate the pain