Medical treatment using therapeutic heat generated by electrical current or electromagnetic radiation to treat disease or injury in tissues.
From Greek 'dia-' (through) + 'thermē' (heat) + 'therapy' (treatment), combining Greek roots for heat transmission with the concept of therapeutic treatment in medical practice.
Diathermotherapy was revolutionary in the 1920s and 30s—it could heat tissues deep under the skin without burning the surface, which made it one of the first non-invasive ways to treat internal muscle and joint injuries.
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