Doc here: inflammation is a natural response to an external or internal injury, lot of stuff happens. Cells work, attack and repair stuff. Blood vessels increase their flow – hence we have the redness (rubor in latin), swelling (tumor, which do not means cancer) and heat (calor). Plus some chemicals are produced that gives you the feel of pain (dolor)
Basically inti-inflammatory drugs inhibit those chemicals
Not to be confused with the word infection which is the colonization of a tissue by a bacteria/fungus/virus etc
Edit: typo
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