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Good evening, I am Dr Ruff, thank you for contacting us today
I am sorry to hear of your recent diagnosis. In answer to your question, no it wouldn't. Your pituitary is situated behind your eyes, it is not close to the spinal chord, and therefore would not cause back pain.
No, these hormones wouldn't have anything to do with your back either.
It is more likely a musculoskeletal issue, but yes, I would see someone if it persists so that they can examine you to try and establish the cause.
No worries, all the best with this.