间质性膀胱炎（Interstitial cystitis ，IC）是一种原因不明的膀胱疾病，其病征是频尿（通常每10分钟一次）、尿急，与骨盆或是膀胱感到压力或疼痛。

1. ↑ The Interstitial Cystitis Survival Guide: Your Guide to the Latest Treatment Options and Coping Strategies ISBN 1-57224-210-8

Interstitial cystitis (IC), also known as bladder pain syndrome (BPS) or by several similar names, is a chronic inflammatory condition of the submucosal and muscular layers of the bladder. IC/BPS may be associated with urinary urgency, urinary frequency, waking at night to urinate, and sterile urine cultures. IC/BPS can result in a quality of life comparable to that of a person with rheumatoid arthritis, chronic cancer pain, or on kidney dialysis.