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What is inflammation?

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Quick answer

Inflammation is the body's defensive response to injury or infection — the redness, heat, swelling, and pain at a hurt site. It's the immune system rushing blood and cells to fight invaders and start repair, though long-term inflammation can cause harm.

Key things to understand

  1. It's the immune system's first response to damage or infection.
  2. Blood vessels widen, bringing more blood, cells, and warmth.
  3. Classic signs: redness, heat, swelling, and pain.
  4. Short-term, it fights germs and starts healing.
  5. Chronic inflammation is linked to many diseases.

People also ask

Why does an injury get red and swollen?
The immune system widens blood vessels and sends fluid and cells to the area to fight infection and repair damage, causing redness and swelling.
Is inflammation good or bad?
Short-term inflammation is essential for healing; long-term, chronic inflammation can damage tissues and contribute to disease.
What is chronic inflammation?
Low-grade inflammation that persists for months or years, linked to conditions like heart disease, diabetes, and arthritis.