M02.9: Reactive arthropathy, unspecified
Reactive arthropathy is a condition in which a person's joints become inflamed, usually as a reaction to an infection present elsewhere in the body. This inflammation can noticeably cause joint pain, swelling, and stiffness, often affecting the knees, ankles, and feet. It is termed 'unspecified' when the precise cause or character of the inflammation isn't clearly defined or known. The infection that triggers reactive arthropathy can be bacterial or viral, and may occur in the genitourinary or gastrointestinal tract. The symptoms and joint involvement typically appear one to four weeks following the infection. While anyone can develop reactive arthropathy, it's more typical in people between the ages of 20 and 50. It is not contagious and does not directly damage the affected organs, however, it can significantly interfere with the person's mobility and quality of life.
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