I am 30 yrs. old and for the last 3 mos i have had to push/strain in order to urinate. When I first sit down a little will come out on it's own, then I have to push and strain in order to empty my bladder. Even after that it still feels like my bladder is not compltely emptied. What are some causes of this. I do not burn or have frequent urination periods, I did feel pain in my lower back (like a kidney infection) shortly before this started., and I have never had any problems with dehydration, urination etc, I also read something about opiates causing this, I do not take any. Any help would greatly be appreciated, I do not have medical insurance so if I knew whether or not this was serious it would help than to struggle to go to the doctor for nothing?