英國 Keele 大學的專家研究發現：咒罵以及發出一些粗俗的語言，可以擁有止疼效果。

為了證明這個理論研究人員把自愿者的手放入冰塊中，他們不斷咒罵。反復實驗之后，發現有咒罵的人心率會加速，同時也可淡化疼痛效果。

研究人員發現咒罵不僅僅是一個情緒化的事情，而也可能反應到省力上。博士 Richard Stephens 說：人類從有語言開始，就有了咒罵。它由大腦中心控制，而不是像大多數語言一樣由大腦左半球控制。這說明咒罵對人類可能還有一些潛在原因。

Scientists from Keele University found that letting forth a volley of foul language can have a powerful painkilling effect, especially for people who do not normally use expletives.

To test the theory, student volunteers placed their hands in a bucket of ice cold water while swearing repeatedly.

They then repeated the exercise but, instead of swearing, used a harmless phrase instead.

Researchers found that the students were able to keep their hands submerged in the icy water for longer when repeating the swear word - establishing a link between swearing and an increase in pain tolerance.

They also found that the pain-numbing effect was four times more likely to work in the volunteers who did not normally use bad language.

The team believes the pain-lessening effect occurs because swearing triggers the ''fight or flight'' response.

The accelerated heart rates of the students repeating the swear word may indicate an increase in aggression, in a classic fight or flight response of ''downplaying feebleness in favour of a more pain-tolerant machismo''.

The research proves that swearing triggers not only an emotional response, but a physical one too, which may explain why the centuries-old practice of cursing developed and why it still persists today.

Dr Richard Stephens, who worked on the project, said: ''Swearing has been around for centuries and is an almost universal human linguistic phenomenon.

''It taps into emotional brain centres and appears to arise in the right brain, whereas most language production occurs in the left cerebral hemisphere of the brain.

''Our research shows one potential reason why swearing developed and why it persists.''