What is bladder cancer?
Bladder cancer usually arises from the lining of the bladder. Men are affected about three times as often as women; smoking is the most important risk factor, followed by occupational exposure to certain chemicals such as dyes, rubber or paints.
Around three quarters of tumours are confined to the lining at diagnosis (non-muscle-invasive). They can be removed endoscopically through the urethra but tend to recur – consistent follow-up is therefore essential. If the tumour grows into the bladder muscle, more extensive treatment is required.
The most important warning sign is painless blood in the urine – even if it happens only once or disappears on its own. Persistent urgency or burning without a proven infection should also be investigated.