We analyzed the incidence of anal disease in patients with nonbacterial prostatitis (NBP) or with prostatitis-like syndrome (PLS), and evaluated the clinical efficacy. The complicated rate of anal disease in these patients was 29.7% (31.8% for NBP and 28.1% for PLS), and the overall incidence of active anal disease was 15.4% (16.2% for NBP and 14.8% for PLS), it yielded a significantly higher complicated rate than other urological disease (p less than 0.01). The most common type of anal disease was hemorrhoids, especially piles. The clinical cure rate for anal disease in NBP patients was 71.4%, and in PLS patients was 58.2%. The high incidence of hemorrhoids (especially piles) was in these patients by clinico-statistical observation suggests that the development of anal disease may be etiologically correlated with NBP and PLS. Furthermore, we noted that Kampo treatment (Keisibukuryogan) was useful in the treatment of prostatitis complicated by anal disease, especially when combined with anti-hemorrhoidal suppositories against active anal disease in PLS patients (p less than 0.05).