Cystitis is inflammation of the bladder. The term interstitial cystitis is used when the disease is chronic. It is much more common in women than in men, and the cause is unknown, although it is known to be not caused by bacterial or viral infections. People affected by this type of cystitis have a completely inflamed and painful bladder wall, which causes scars on the bladder or causes stiffness, which causes the inability to expand as it fills with urine. Symptoms vary widely, but often include impulses to urinate urgently, frequent urinating, and even pain during sexual intercourse. There is no definitive cure for interstitial cystitis, so treatments are usually focused on improving symptoms, and may include: diet, exercise to control the bladder, medications, physical therapy, etc.