Several studies have linked asthma to anxiety disorders and depression. Now a U.S. study of 3,065 pairs of twins who both served in the Vietnam war has suggested that asthma could be linked to post-traumatic stress disorder (PTSD) as well. The study found that among all twins those who suffered from the most PTSD symptoms were 2.3 times as likely to have asthma compared to those who suffered from the least PTSD symptoms. The scientists found the association between asthma and PTSD existed even after they took into account factors such as cigarette smoking, obesity and socioeconomic status, all of which are associated with both anxiety disorders and asthma.
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