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Updated July 14, 2006

Definition: Lesion is a non-specific term used in medicine to refer to a pathology of tissue. It indicates an area of tissue that has been injured, destroyed, altered (for the worse) or has a problem.

There are many types of lesions, from cancerous to non-cancerous. Lesions can also be classified according to criteria such as size, pattern or location.

Examples of lesions in the spine might include a herniated disk, or trigger points in a spinal muscle.

Source: Medicinenet. Lesion Definition. Retrieved: June 27, 2006.
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