If you have penis pain, it will be 100% prostate, unless you have something visibly growing all over it.
TRUST me prostate problems you feel in your dick.
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If you have cysts up your rectum near your prostate you will have back ache, and dick pain.
Need to take a pee, but no more pee left? Up all night siting on the crappa, don't know if you need a shit or a haircut?....... That's prostatitis ....... fun fun fun.
The answer to inflamed prostate BTW is a cold carrot up your rear, whilst training a hot hair dryer at your groin, and eating ibuprofen, whilst apologizing profusely to any god you do or don't believe in.