Urinary tract infection is an inflammation of the urinary tract caused by bacteria. There are many causes of inflammation such as from the blood or lymph, neighboring organs, but the most common is the upstream invasion from the urethra of bacteria, especially intestinal bacteria (E.coli, ...). This is an easy to treat disease if detected early.

Cystitis is one of the common urinary tract infections. The source of infection is mostly upstream from the outside into the body through the urethra. So should you have sex if you have cystitis?