https://doi.org/10.1351/goldbook.11830
Reaction of the body to injury or to infectious, allergic, or chemical irritation; characterized by redness, swelling, heat, and pain resulting from dilation of the blood vessels accompanied by loss of plasma and leukocytes into the tissues.
Note: This process differs in the brain, where lymphocytic invasion requires compromise of the blood–brain barrier, although T-cells can enter the brain for surveillance.
See: neuroinflammation