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We developed a questionnaire to assess the effect of finasteride on symptoms of benign prostatic hyperplasia (BPH) by modifying that of Boyarsky (1977). To validate the questionnaire, a cohort study was conducted in 2 groups of patients with BPH and 3 control groups without BPH. The BPH groups were: (1) 34 patients before TURP (transurethral resection of the prostate), average age 68 years; (2) 65 patients after TURP, average age 68 years; (3) 40 patients after other nonserious nonurological surgery, average age 50 years; (4) 14 healthy non-BPH volunteers, average age 58 years; and (5) 73 healthy non-BPH volunteers, average age 37 years. The questionnaire was administered once to all subjects, and a subset responded to a second administration. Mean total symptoms scores (TSS) from the initial questioning were 6.4, 3.2, 2.9, 2.6, and 1.6 for the 5 groups, respectively (pooled SD = 3.3); mean total troublesome symptoms scores (TTSS) were 4.8, 2.1, 1.4, 1.1, and 0.6, respectively (pooled SD = 2.2). All other groups were significantly less symptomatic and troubled than the pre-TURP group, and all surgical groups were significantly more so than the younger volunteer group. These data demonstrate the discriminant validity of the questionnaire. Corroborating prior data [Gregg et al., 1990], responsiveness was shown by the 3.7-point mean TSS improvement in response to TURP, which was significantly different from the near-zero changes in the other groups. Reproducibility was shown by kappa statistics being nearly all greater than 0.75 and an intraclass correlation coefficient of 0.64; construct validity and reliability were demonstrated by correlation (r = 0.7) with a general urination problems question; and internal consistency was documented by Cronbach's alpha values of approximately 0.6. We conclude that this questionnaire is a useful and validated tool for assessing BPH symptoms.