Please make sure you recognize that this forum is for educational purposes only, and it does not
substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I can not tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information.
Local back pain, as you are describing, is usually a result of irritation of or damage to structures of the spine (e.g., periosteum, ligament, dura, and joints).