In 1998, in response to the growing concerns that many returning Gulf War veterans began reporting numerous health problems that they believed to be associated with their service in the Persian Gulf, Congress passed two laws which directed the Secretary of Veterans Affairs to enter into a contract with the National Academy of Sciences. They were tasked to review and evaluate the scientific and medical literature regarding associations between illness and exposure to toxic agents, environmental or wartime hazards, and preventive medicines or vaccines associated with Gulf War service. In addition, the Institute of Medicine of the National Academy of Sciences provided conclusions to these studies that were considered when making decisions about compensation to veterans. "Gulf War and Health Volume 4: Health Effects of Serving in the Gulf War" summarizes in one place the current status of health effects in veterans deployed to the Persian Gulf irrespective of exposure information. This book reviews, evaluates, and summarizes both peer-reviewed scientific and medical literature addressing the health status of Gulf War veterans.