Failure to diagnose cancer in teenagers may be medical malpractice. Because cancer in young adults and teenagers count for only 1% of all diagnosed cancers, they have a higher risk of being misdiagnosed. A recent report “Improving Diagnosis: Teenage Cancer Trust Report on Improving the Diagnostic Experience of Young People with Cancer” was recently published by the Teenage Cancer Trust in London. This report discusses challenges to early diagnosis of cancer for teenagers and offers guidance for clinicians and families to improve care for these patients.