This document discusses cancer in teens. It begins with an overview, defining cancer and its causes. The most common cancers in teens are osteosarcomas (bone cancer), leukemia (blood cancer), and brain tumors. Symptoms of cancer can include exhaustion, lumps, headaches, and unusual bleeding. Doctors use tests like blood tests, biopsies, and imaging to diagnose cancer. The main treatment methods are surgery, chemotherapy, and radiation, and the goal is detection and treatment as early as possible. Support is important for teens undergoing cancer treatment.