type A behaviour

A form of behaviour exhibited by people who tend to be aggressive, competitive, tense, time-conscious, and generally hostile. Although not all people who exhibit type A behaviour have an increased risk of heart attacks, those who are chronically hostile or cynical are twice as likely to suffer coronary heart disease as people who have a more relaxed and tolerant attitude. The reasons for the relationship between hostile behaviour and heart disease are not clear. It has been suggested that the hormones produced during hostility may do some physical damage, or that people who exhibit such negative behaviour do not maintain good health habits, such as exercising and eating a balanced diet. Compare type B behaviour.

A form of behaviour characterized by a high level of aggression, competition, drive, time urgency, and vigorous voice stylistics. Type A behaviour has been linked with increased risk of coronary heart disease. However, it may be possible to alter type A behaviour patterns by taking aerobic exercise so that the risk of heart disease is reduced. Compare type B behaviour.