Inflammation of fibrous connective tissue, often causing pain and stiffness, particularly in muscles and joints.
From fibro- + -itis (Greek -itis, inflammation). This medical term emerged in the 19th century to describe inflammatory conditions of fibrous tissue.
Your doctor might diagnose fibrositis when you have mysterious muscle pain and stiffness that doesn't fit perfectly into other categories—it's like your connective tissue got irritated and swollen, sort of a 'soft tissue inflammation' catch-all.
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