A patient twisted her ankle. Immediately after the injury, the ankle became swollen, red, painful, and warm to the touch. The medical term for this is:

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The symptoms described (swelling, redness, pain, warmth) are all classic signs of inflammation, which is the body's response to injury or infection. A hematoma is a collection of blood outside of blood vessels, and while it can cause swelling, it wouldn't necessarily cause redness or warmth. Anemia is a condition in which there are not enough red blood cells to carry oxygen throughout the body, and it does not cause the symptoms described. Allergy is a hypersensitivity reaction and can cause a variety of symptoms, but again, the symptoms described are most consistent with inflammation.

A Patient Twisted Her Ankle