Your doctor is correct. Prostatitis is rated in 4 categories. Cat. 3 and 4 are due to a bacterial infection and treated with an antibiotic and ibuprofen. Cat 2 and 3 are inflammation of unknown source. Cat. 1 is inflammation that is asymptomatic and no treatment is involved. Cat. 2 and 3 are harder to treat due to the unknown nature of the inflammation. Ibuprofen is used and sometimes antibiotics prophylactically. I hope this helps.