Yes, I Am Very Concern About All The Side Effects

Yes, I am very concern about all the side effects which are numerous. I had a complete body scan (12/16) and there was no signs of any cancer. I have also had two MRI's on the palvic area,in the last ten years with no signs of any cancer. Had MRI 's three times 2004, 2006, 2011 with no signs of cancer
The one thing that this Urologist Doctor is using as a reason for Lupron injection is my PSA readings. I had a radical prostrate operation 20 years ago. Starting 12 years ago my PSA has increased to 3.8. Currently I have no systems of any kind.
In your experience would you first apply Lupron Injection based solely on my PSA increase from o to 3.8 in A 12 years period?
Thanks for your professional advise
Federico Montoya