Definition of Brief reactive psychosis:

Brief reactive psychosis is a sudden, short-term display of psychotic behavior, such as hallucinations, that occur with a stressful event.

Causes, incidence, and risk factors:

Brief reactive psychosis is triggered by some type of extreme stress (such as a traumatic accident or loss of a loved one), after which the person returns to the previous level of function. The person may or may not be aware of the strange behavior.

This condition most often affects people in their 20s and 30s. People who have personality disorders are at greater risk for having a brief reactive psychosis.