More than half of children who are the victims of bullying developed depression as a result of the abuse, according to a survey.
Beat Bullying quizzed 2,000 parents and adults across Europe and found a further 35% of victims began harming themselves and 38% contemplated suicide.
However, the same poll exposed a large minority of adults who consider bullying just part of growing up.
Some 34% thought school yard abuse was inevitable and 16% regarded it as character building.
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Nick Clegg will attempt to win over the female electorate when he kicks off the Liberal Democrats' general election campaign later today.
Up to £140 billion of savings could be released when over 55-year-olds are allowed to cash in their pension pots from April 6th.
The party's plans include a £2.5 billion Time to Care fund for the NHS, capping rail fare increases and 3,000 more midwives.