Inflammation of the muscles of the head, a medical condition combining head and muscle inflammation terms.
From Greek kephalē (head) + mys (muscle) + -itis (inflammation). This medical term follows the standard 19th-century pattern of building diagnoses by stacking Greek roots with the -itis suffix to indicate inflammation.
The '-itis' ending is basically medicine's universal 'inflammation signal'—doctors can attach it to almost any body part to instantly convey 'this thing is inflamed,' which is why hundreds of medical conditions end in this suffix.
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