Inflammation is the body's immune response to injury, infection, or irritation, characterized by redness, heat, swelling, pain, and sometimes loss of function. This response is protective—increased blood flow brings immune cells to fight infection and initiate healing, while swelling protects damaged areas. Acute inflammation is a normal, beneficial response that resolves as healing progresses. Chronic inflammation, however, persists over time and can damage tissues, contributing to conditions like heart disease, diabetes, arthritis, and some cancers. Reducing chronic inflammation through lifestyle factors (diet, exercise, stress management, sleep) and managing inflammatory conditions is important for long-term health. Anti-inflammatory medications reduce inflammation and associated pain but don't address underlying causes. Understanding inflammation helps people recognize normal healing responses while also appreciating how chronic inflammation can harm health over time.