<b><i>Introduction:</i></b> It was aimed to show the relationship between benign prostatic hyperplasia and inflammation by measuring urinary C-reactive protein values before and after alpha-blocker treatment. <b><i>Methods:</i></b> A total of 71 patients with a total prostate-specific antigen &#x3c;3.5 ng/mL, International Prostate Symptom Score &#x3e;7, and maximum urinary flow rate &#x3c;15 mL/s were included in the study. Doxazosin 4 mg p.o. once daily was started orally as an alpha-blocker treatment. Serum and urine C-reactive protein values, International Prostate Symptom Score, maximum urinary flow rate, and the post-void residual volume of patients were recorded at the first admission and in the first month of alpha-blocker treatment. <b><i>Results:</i></b> The mean age of the patients was 59.2 ± 7.5 years. The mean serum C-reactive protein values of the patients at the first admission and follow-up were 2.62 ± 1.8 (range, 0–5) mg/L and 2.83 ± 1.6 (0–6) mg/L, respectively. The mean urine C-reactive protein values of the patients at the first admission and follow-up were 0.45 ± 0.11 (range, 0.28–0.99) mg/L and 0.14 ± 0.04 (range, 0.79–0.328) mg/L, respectively, which was statistically significantly different. In the subgroup analysis, the urine C-reactive protein level change was more prominent in severely symptomatic patients than in moderately symptomatic patients. <b><i>Conclusion:</i></b> Our results showed that C-reactive protein was detectable in urine, alpha-blocker treatment significantly reduced urine C-reactive protein levels, and the decrease was more prominent in severely symptomatic patients.