Personality And Health May Be Connected By WNIJ • Dec 30, 2014 TweetShareGoogle+Email Your personality could influence your health. That's according to a study published in the journal Psychoneuroendocrinology. Research shows extroverts tend to have stronger immune systems than introverts. Experts say personality testing could help doctors design special treatments in the future. Tags: personalityhealthTweetShareGoogle+EmailView the discussion thread.