Swimming too often in chlorinated water could increase the risk of getting bladder cancer, claim scientists.

Researchers say cancer-causing chemicals called trihalomethanes (THM) are created as a byproduct of chlorinating water and increase the risk of the disease developing.

Taking a shower, having a long bath or going for a swim can increase the risk - albeit small - of absorbing THM through the skin, say the Spanish academics.

All three activities are associated with keeping clean or enjoying leisure time, and are much more likely to be undertaken by the wealthy.

The team examined 1,270 people and found wealthy individuals who drank more bottled water - to avoid the health risks posed by drinking tap water - cancelled out any beneficial effect by swimming more and taking more showers.

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