Cystitis refers to inflammation of the bladder. Most often, the inflammation is caused by a bacterial infection. Most cases of cystitis are caused by a type of Escherichia coli (E. coli) bacteria.
Bacterial bladder infections may occur in women as a result of sexual intercourse. But even sexually inactive girls and women are susceptible to lower urinary tract infections because the female genital area often harbors bacteria that can cause cystitis.
Less commonly, cystitis may occur as a reaction to certain drugs, radiation therapy or potential irritants, such as feminine hygiene spray, spermicidal jellies or long-term use of a catheter.
An uncircumcised penis can trap bacteria, which can lead to a urinary tract infection. It is possible that during intercourse the infection can be passed on.