Yeah, usually unless you have already existing BPH or something, then T therapy will not cause any problems. I agree completely with Lion, high E2 is normally the cause. You should have the doc check that.
Are you using any anti E at all?
Some simple remedies if it is not already too bad is Saw Palmetto, Stinging Nettle, Lycopene, fish oil, with Saw and Stinging Nettle or some blend in a prostate formula being tops.