Dr. Stephanie Rasmussen takes you and 2 excellent discussants on an exploration of a case of altered mental status. The UCD43 is a curricular list of 43 common chief complaints that all UCD medical students should be comfortable with by the time they graduate from medical school. We hope other medical schools and residency training programs will also find this list helpful. (For more on the UCD43, please go to www.UCD43.com)