What Causes Depression Post Back Surgery?
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Detailed Answer:
I read your question carefully and I appreciate your concern.
Judging by the description I do not really see any objective reason to think there is something else wrong. I suppose she had a MRI before the surgery which would evidence any tumor, infection, trauma etc. In addition the surgeon has visually explored the site which adds more certainty.
Furthermore the fact that she's a little better confirms it as well, other worrying alternatives like tumor or infection would keep growing and the situation deteriorate.
So I do not think there is something to fear. It is common for people with chronic pain and reduced motility to develop depression. Perhaps the fact she's off the opioids plays some role as well.
If the situation doesn't improve you should talk to her physician about using antidepressants. Apart from helping with depression some of them like Duloxetine or Venlafaxine are also used for chronic pain treatment, so it might help with that as well.
I hope to have been of help.