Eustress is defined in the model of Richard Lazarus (1974) as stress that is healthy or gives one a feeling of fulfillment.

Distress is the most commonly-referred to type of stress, having negative implications, whereas eustress is a positive form of stress, usually related to desirable events in person's life. Both can be equally taxing on the body, and are cumulative in nature, depending on a person's way of adapting to a change that has caused it.^[1]