Not all teenagers will be getting such good news in their results

Exam worries have been identified as a leading cause of suicide attempts among teenagers and the Samaritans are campaigning to help vulnerable youngsters and to raise awareness among parents.

There will be guidance on recognising and responding to stress symptoms such as sleep problems, eating disorders, panic attacks and mood swings.

An internet site, to be launched on Friday, will carry advice for young people and there will be radio adverts highlighting exam worries, featuring television presenter Jamie Theakston.

"Every year a number of young people take their own lives during the exam period," said the chief executive of the Samaritans, Simon Armson.

"These tragic suicides often hit the headlines - the despair that many young people feel is often caused by deep-rooted emotional problems, which can be triggered by the pressure of exams and the expectations of family, peers and teachers."