Brain injury is like a volume control knob. It’s an "equal opportunity" disorder that affects everything. It may amplify pre-morbid
conditions. For example, a patient with a learning disability may struggle more with learning.
Anxiety is an example of a factor that can be both a pre-existing condition and a result of the injury. If the patient tends toward anxiety, he or she will likely have more anxiety due to the injury. It’s impossible to determine what percentage of the anxiety was present before and what came after.
With any of these heightened issues, it doesn’t matter whether it’s the chicken or the egg. You must treat it, or your patient won’t get better.