National Academy of Sciences' Institute of Medicine officials found in their most recent study on the health effects of the Gulf War released April 9 that military service in the war is a cause of post-traumatic stress disorder in some veterans and also is associated with multiple other medical symptoms. Researchers did not find a cause-and-effect relationship between a host of other illnesses found in the veterans, but acknowledged sufficient evidence of an association between their service and other psychiatric disorders such as anxiety and substance abuse and gastrointestinal problems.