Can You Have Prostate Cancer Even if Your PSA is 0?

A chum of mine who had already been diagnosed with a tumour on the prostrate

has been going through hell with pain for months. You can imagine his thoughts and

stress. Finally a series of scans have brought up evidence of Spondylitis.  

Great relief then, but tempered with the fact that the principal solution is painkillers

only. It is not a disease that  has a cure.

I am 45 years  old, and  have moderate to severe pain and spasms in the area of prostate. It's hard to descibe exact location of the pain.Sometimes it's triggered by defecating or right after ejaculation, or sitting for prolong period, it wakes me up at night as a gradual discomfort and becomes severe pain. The spasm usually occur after the sharp pain begins to subside and feels like the same when you ejaculate in the same area, except it's painful. Please advice Dr.