Smithsonian has an article titled “The History of Boredom.”

Recent scientific research agrees: A host of studies have found that people who are easily bored may also be at greater risk for depression, anxiety disorders, gambling addictions, eating disorders, aggression and other psychosocial issues. Boredom can also exacerbate existing mental illness. And, according to at least one 2010 study, people who are more easily bored are two-and-a-half times more likely to die of heart disease than people who are not.