Cancer & oncology

Cancer is not one disease but more than a hundred, each defined by cells that grow and spread when they should not. This section covers the cancers people ask about most, starting with breast cancer, and the warning signs shared across many types: a lump that does not go away, unexplained weight loss, unusual bleeding, or fatigue that rest does not fix. You will find what raises risk, how doctors diagnose and stage a cancer, and the treatments available today, along with the screenings that catch cancer early, when it is most treatable. If a symptom worries you, see a doctor rather than wait.