One of the recurring themes across many cancer types is that early symptoms frequently overlap with every day, benign conditions: a cough that seems like it should just be a lingering cold, indigestion that feels like ordinary heartburn, fatigue that seems explainable by a busy schedule. This overlap is not a coincidence or a failure of medical awareness; it reflects genuine biological similarity in how the body responds to irritation, whether from infection, inflammation, or, less commonly, a tumor.