Frustration tolerance is the ability to withstand obstacles and stressful situations. Decreased frustration tolerance is a common behavior problem of people who have brain injuries. Low frustration tolerance can be a direct result of brain damage as well as a secondary reaction to the lifestyle changes and losses which might accompany a brain injury. Typically conceptualized as an executive functioning impairment, low frustration tolerance is viewed as a problem with self-regulation. Behavioral manifestations include irritability, aggression, lability, and refusal to participate. As with other behavior problems, difficulties with frustration tolerance are often exacerbated by fatigue.