Surely, inflammation is half a billion years old, since even the lowly starfish may experience it. Virtually every human being who ever lived has suffered from it, perhaps dozens or hundreds of times. But why? And what is it? Pathology textbooks take refuge in rolling Latin, describing inflammation by its signs: rubor, calor, tumor, dolor (redness, heat, swelling, pain). It is the reaction of a part or all of the body to injury. In its later stages it includes the processes needed to repair the injury.
Clearly, such a universal phenomenon should have...
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