Personality traits. When they're a problem.
D000367:Age Factors; D001007:Anxiety / Q000523:psychology; D005239:Fear / Q000523:psychology; D006801:Humans; D007398:Interpersonal Relations; D007439:Introversion, Psychological; D010551:Personality; D010554:Personality Disorders / Q000209:etiology / Q000523:psychology*