Science
What is Inflammation?
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.
See it, don’t just read it.
Watch a 2-minute lesson with voice + animation that explains inflammation.
Key things to understand
- 1It's the immune system's first response to damage or infection.
- 2Blood vessels widen, bringing more blood, cells, and warmth.
- 3Classic signs: redness, heat, swelling, and pain.
- 4Short-term, it fights germs and starts healing.
- 5Chronic inflammation is linked to many diseases.
Frequently asked questions
- 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.