Risk factors in both men and women include:
• Interference with the flow of urine: This can occur in conditions such as a stone in the bladder or, in men, an enlarged prostate.
• Changes in the immune system: This can happen with certain conditions, such as diabetes, HIV infection and cancer treatment. A depressed immune system increases the risk of bacterial and, in some cases, viral bladder infections.
• Prolonged use of bladder catheters: These tubes may be needed in people with chronic illnesses or in older adults. Prolonged use can result in increased vulnerability to bacterial infections as well as bladder tissue damage.
In men without any predisposing health issues, cystitis is rare.
Courtesy: Mayo Clinic