The psychosocial impact concept improves the understanding of the effects of disasters on people and communities. However, its definition is not clear. This work explores consistencies between studies (k = 21) that refer to the psychosocial impact of disasters by way of a meta-analytic synthesis. This synthesis indicates that people are more prone to illness when they are exposed to a disaster, and less when they are protected (OR = 2.737). Please check the change conveys the intended meaning or amend Nevertheless, there are no differences in healthy responses, regardless of how protected or exposed they are (OR = 1.053). Finally, a model is proposed to explain four types of psychosocial impact: resilient, traumatic, sensitive, witness.