My initial reaction to this article was, "well, duh," but.. it's still interesting: Quote: CHICAGO - Children who have long, frequent or aggressive temper tantrums may be at risk of depression or disruptive disorders, U.S. researchers said on Thursday. They said tantrums were often the sign of a sick, hungry or overstimulated child. For most parents, they were a normal part of development and should be viewed as a teaching opportunity. But parents of children who hurt themselves or others and those who cannot calm themselves without help should seek medical help, they found. Healthy children tended to have less aggressive, and generally shorter tantrums.