A YouGov survey of 2,000 people found 12% of people say they have trouble controlling their anger.
One in four says they worry about how angry they sometimes feel and 64% think people in general are getting angrier.
Chronic and intense anger has been linked to heart disease, cancer, stroke, colds and flu as well as depression, self-harm and substance misuse, the charity's Boiling Point report said.
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Dr Andrew McCulloch, Mental Health Foundation
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And anger is more likely to have a negative effect on relationships than any other emotion.