Cystitis is a medical condition characterised by an inflammation of the bladder. In most cases, cystitis is caused by a bacterial urinary tract infection. Cystitis could also occur when the body’s naturally occurring bacterial ecosystem becomes imbalanced. Cystitis may be triggered by certain medications or personal hygiene products. Long-term use of a catheter for urination could also cause cystitis. The treatment for cystitis usually depends on the underlying cause. Cystitis can occur in anyone but is most common in women.