M79.0: Rheumatism, unspecified

Rheumatism, unspecified (M79.0), is a broad term used to describe a variety of conditions that are characterized by pain, swelling, or stiffness in the joints or muscles. While the exact cause is often difficult to determine, it's generally understood that these conditions are related to the body's immune response adversely affecting its own tissues. Rheumatism may be triggered by various factors including a genetic predisposition, environmental triggers, or a combination of both. Symptoms typically include discomfort, weakness, and restricted movement in one or more areas of the body. Disease progression can vary considerably from patient to patient. Some may experience periods of flares and remission, while others may have persistent symptoms. Systems commonly affected include the musculoskeletal, cardiovascular, and nervous systems. Rheumatism can be recurrent or chronic, leading to functional loss and impaired quality of life.