RS, or Rheumatoid Arthritis, is a chronic inflammatory disorder that primarily affects the joints. It occurs when the immune system mistakenly attacks the body's own tissues, leading to pain, swelling, and stiffness. Over time, this condition can result in joint damage and loss of function. The exact cause of RS is not fully understood, but it is believed to involve a combination of genetic and environmental factors. Treatment typically includes medications to reduce inflammation and manage symptoms, as well as lifestyle changes to improve overall health and mobility. Early diagnosis and intervention are crucial for better outcomes.