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Is there any difference between swelling and tumor?
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If not, these definitions seem fairly clear. If I twist my ankle, or if a wasp stings me, there may be a swelling at the place. In time, this will disappear, This is very different from a tumor, which is usually inside the body, will usually continue to grow, and may cause death.
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For those unfamiliar with the term: Definitions of neoplasia - OneLook Dictionary Search