People who seem to worry all the time suffer a condition, though not a disorder, called generalized anxiety disorder. Some worry about everything conceivable and others have one worry that preoccupies them throughout the day. Dr. Fredric Neuman explains that some patients worry because they are trying to anticipate danger. He has a parable of two cavemen that shows the benefits of worrying as well as explains why so many people worry today. The short version is that worrying is good for our survival as a race, but it is important to focus that worry on things that ought to be worried about.
Read the full article here: Why People Worry All the Time (A Tale of Bernie and Charlie)