Osteoarthritis is a common form of arthritis where cartilage in joints breaks down over time. It causes pain, stiffness, and loss of mobility in joints like the hands, hips, and knees. While there is no cure, treatments can help manage symptoms and maintain activity. For mild cases, initial treatments include exercise, weight loss, heat/cold therapy, and over-the-counter pain relievers. For moderate to severe cases, stronger medications, cortisone shots, and surgery may be needed to relieve pain and disability. Joint replacement surgery can help severely affected patients resume an active lifestyle.