The 5 main symptoms of cancer in young people Teenage Cancer Trust research has found that less than half of 18-to-24-year-olds can identify any of the five main warning signs of cancer in young people, which are: 1. Amy Harding, Director of Services, at Teenage Cancer Trust, which supports those age 13-24, said: “For the age group Teenage Cancer Trust support there is a need for the National Cancer Plan for England to take actions to speed up diagnosis. “We know there is more to be done to improve outcomes and experience of care for children, teenagers and young adults with cancer. The spokesman also said the Taskforce “will identify tangible ways to improve detection and diagnosis, and ensure the needs of young cancer patients are reflected in the forthcoming National Cancer Plan”. The symptoms might seem so broad, but I never knew weight loss could be a symptom [of cancer].