For veterans like Tim Maynard, scuba diving provides relief from symptoms of PTSD. Maynard goes diving once a week, exploring the Florida Keys and shipwrecks off the coast of North Carolina. Courtesy of Tim Maynard hide caption

itoggle caption Courtesy of Tim Maynard

Lourdes Garcia-Navarro with her husband, James Hider, and their dogs Nena (left) and Ursa. Tara Todras-Whitehill/Lourdes Garcia-Navarro hide caption

itoggle caption Tara Todras-Whitehill/Lourdes Garcia-Navarro

There's data to support the notion that pot, or a drug based on its active ingredient, could help ease the fears of PTSD. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Anne Jones, 62, and Robin Jones, 73, at their home in Menlo Park, Calif. He took a test that revealed proteins typical of Alzheimer's disease. Ramin Rahimian for NPR hide caption

itoggle caption Ramin Rahimian for NPR

Insomnia, feeling isolated, and bursts of anger are symptoms of the anxiety disorder known as PTSD. iStockphoto.com hide caption

itoggle caption iStockphoto.com