Objectives:We investigated the characteristics of recent male and female patients diagnosed with interstitial cystitis (IC), then investigated which therapy was chosen by the attending urologist. Methods: Materials were 282 IC patients diagnosed and treated during the past 3 years (sampling from Japanese IC database). Gender, age, medical history and predominant symptoms were investigated. In addition, we investigated the interval before a diagnosis was established. In laboratory findings, we investigated voided volume, urinalysis findings and cystoscopic findings. Regarding therapy, we investigated which therapy was chosen as the first line. Results: The gender ratio was about 1.0:5.6 (male : female). Regarding age distribution, patients in their 60s were the most frequent (65 cases, 31.3%). The interval before diagnosis of IC was 36.5 months on average (1-360 months). Regarding medical history, intrapelvic surgery was the most common and repeated urinary tract infection was next. The most frequent symptom was urinary frequency (295 cases, 98.3%). Urinary urgency was noted in 186 cases (62%) and supra-pubic pain was noted in 125 cases (41.6%). The once voided volume was 104.3 mL on average (50-200 mL). The most common cystoscopic finding was glomerulation (158 cases). Ulcer was present in only 19 cases. The most widely carried out therapy was hydrodistension (208 cases, 67.9%). Oral suplatast tosilate (197 cases, 65.6%), antihistamine (77 cases, 25.6%) and intravesical dimethylsulfoxide (69 cases, 23%) followed. Conclusions: Regarding characteristics, the age distribution was older than other countries. The most frequent symptom was urinary frequency. Oral suplatast tosilate was one of the popular therapies in Japan.