I always have a pain in the low back since I have prostatitis , is that normal or I've got other diseases?

It is normal for prostatitis patients to have pain in lower back. 
I suggest you to take Diuretic and Anti-inflammatory Pill to cure your prostatitis. It cures prostatitis effectively in about three months and then you will never suffer from the disease and those pain any more.
It is a kind of traditional Chinese medicine made from almost 50 kinds of elements and each of them have their unique function in curing prostatitis. Some of them can promote blood circulation and dissolve stasis, some can promote Qi and stop pain, some can kill bacteria, virus, mycoplasma and chlamydia, and some can clear away heat and dampness. They all aiming at eliminating your symptoms of ptostatitis to cure it.
The herbs in its recipe are as safe as food, so there would be no side effect, allergy or any drug resistance. If you take it for a months, you can feel your symtoms release, and your test of prostatitis and chlamydia would all be normal after taking the pills for three months.                                    
Released in 2011-01-12 14:37:16