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Inflammation

Redness, swelling, pain, and/or a feeling of heat in an area of the body. This is a protective reaction to injury, disease, or irritation of the tissues.

PubMed Health Glossary
(Source: NIH - National Cancer Institute)

Terms to know

Fever
An increase in body temperature above normal (98.6 degrees F), usually caused by disease....
Immune System
The body's system for protecting itself from viruses and bacteria or any foreign substances....
Tissue
A group of cells that act together to carry out a specific function in the body. Examples include muscle tiss...

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