Why do some people develop anxiety disorders and others do not? Is it simply a matter of personality? Some people are more nervous than others, does that play a role or is there more to it? While scientists and researchers don't understand all the reasons why someone may develop an anxiety disorder, it does seem to be more than a personality trait. Heredity does play a large role in whether or not you have a higher risk for anxiety. If your parents or grandparents suffered from anxiety, ...