About 4% of the adult population and about 1% to 2% of children experience chronic attacks on a daily or near daily basis. While there is uncertainty about the biological mechanisms that lead to headache "chronification," the epidemiologic literature has provided some insight into modifiable and nonmodifiable factors that appear to influence risk of headache progression. This review summarizes the evidence from population-based studies related to the chronic daily headache phenotype, natural history, and risk factors that may influence incidence, prevalence, or prognosis.

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African Americans are diagnosed at late stages and suffer disproportionately higher mortality rates from colorectal cancer (CRC). Increasing their participation in CRC screening can help reduce these disparities. In-depth personal interviews were conducted with 60 African Americans to understand if CRC test preferences exist and to identify what attributes of screening tests influence test preferences. Most individuals interviewed preferred colonoscopy as compared to FOBT. Previous participation in CRC screening influenced how individuals made decisions about CRC screening. Enabling individuals without CRC screening experience to first complete FOBT might prepare them to later participate in colonoscopy screening.

Migraine or headache is a common problem in the active duty population, in the recently deployed service members, and is a cardinal symptom of traumatic brain injury. While there is increasing appreciation of the clinical burden of post-traumatic headache (PTHA) in the military traumatic brain injury population, there remain significant research gaps related to the epidemiology of PTHA, including lack of understanding of natural history, whether there are predisposing factors that predict the development or prognosis of headache post trauma and, most basically, the features that distinguish PTHA from other forms of chronic headache. Although diagnostic criteria for PTHA are included in the International Classification of Headache Disorders, 2nd edition, revised, these criteria are somewhat arbitrary and were not empirically defined. This lack of precision about the PTHA phenotype limits the rigor of observational studies of PTH but does not appear to significantly hamper treatment, provided the treatment involves a multi-modality approach.