There is an increasing amount of evidence to suggest that people who suffer from panic attacks are also more likely to suffer from other physical and mental-health problems. Researchers from the University of Manitoba in Winnipeg, Canada used information from the huge U.S. National Epidemioligic Survey on Alcohol and Related Conditions. They studied 34,653 people who were asked about their health in 2001-2 and 2004-5. The study found that those people who had panic attacks in 2001-2 were more likely to have generalised anxiety disorder, panic disorder, social phobia, depression and mania in 2004-5.
Kinley, D. Jolene ... [et al] - Panic attacks as a risk for later psychopathology: results from a nationally representative survey Depression and Anxiety DOI 10.1002/da.20809