Found this after a google search for symptoms.
Men taking Lupron for prostate cancer may find that their symptoms get worse, or that new symptoms appear, during the first few weeks of treatment. If this happens, let your doctor know immediately. Bone pain may increase temporarily, and in rare cases a blockage in the urinary tract or pressure on the spinal cord may appear. If you already have problems in the spine or urinary tract, the doctor will start Lupron therapy with caution.
Also found some references to joint pain as well. I would at the least discuss with the doctor prescribing the medication to be sure their is no concern.