[eggdude]

I agree there are parallels between cases of chronic pain, but I also think there are significant differences. Someone with just chronic pain might think "This pain is too much. I don't have it in me to suffer anymore" whereas a depressed person often causes their suffering with distorted thoughts like "I am always depressed. I have tried everything possible there is to try to get better. No one likes me or wants to be around me. Everything is hopeless. I have no reason to live"