M05.0: Felty syndrome

Felty Syndrome is a rare, advanced form of a condition known as rheumatoid arthritis. This syndrome is marked by three specific medical conditions: rheumatoid arthritis, an enlarged spleen, and a decreased white blood cell count. Its onset is often gradual and it's common for people to have rheumatoid arthritis for ten years or more before Felty Syndrome develops. Symptoms may include fatigue, pale skin, swollen lymph nodes, recurring infections, and pain or stiffness in the joints due to rheumatoid arthritis. It is not fully understood why some people with rheumatoid arthritis also develop Felty Syndrome. It affects multiple body systems such as the immune system causing imbalances, and the splenic and hematological system leading to spleen enlargement and reduced white blood cells respectively. The progression of the disease varies greatly from person to person. It's important to note that this is a general description and individual experiences may vary.