An operational stress injury (OSI) is any ongoing psychological difficulty that has come about from duties performed during military or Royal Canadian Mounted Police (RCMP) service.
What is OSI

An operational stress injury (OSI) is any persistent psychological difficulty resulting from operational duties performed during military or RCMP service. It includes a range of health problems such as anxiety disorders, depressive disorders, substance use and Post-Traumatic Stress Disorder (PTSD) as well as other conditions that may be less severe, but still interfere with daily functioning.

Many experiences can cause operational stress. Although active combat is certainly one of them, there are many other events that are part of the risk of serving in the military or RCMP that can cause such injuries. Taking part in search-and-rescue operations, being involved in a training accident, handling injured bodies, witnessing civilian atrocities or being involved in civilian disaster aid can all cause moderate to severe stress reactions. When these experiences interfere with a person's life, the result is an operational stress injury.

An OSI can affect others in the person's life, leading to marital and family problems. OSIs can also produce physical symptoms such as stomach upset, headaches, and sleep problems, and they can make chronic pain problems worse.



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