It may seem obvious to define or identify what an injury is, but alas this is not the case. There are 2 kinds of injury; the acute and the misuse injury. Misuse injuries are often referred to as overuse injuries, but overuse is only one element of misuse. An acute injury is usually clear, but misuse injuries are more complex. It took me a while to realise that I was experiencing a string of injuries. There is also an overlap between degeneration of the body and injuries. Clearly, as we become older and our bodies are not as resilient then we are more prone to injury. However, if you look after yourself as you age then you are less likely to experience misuse injuries and even young people can experience an overuse injury, so everything cannot always be blamed on the ageing process. Age is a risk factor for injury, but there are a number of other important risk factors such as posture.
Things become even more complex when the concept of injury is applied to mental health. I would argue that there is no reason why it shouldn’t be applied, because there is no reason to assume that the mechanisms that apply to our bodies do not also apply to our minds. The concept of trauma i.e. acute injury is readily applied to mental health, so why can’t the notion of misuse injury also be applied?