Osteoarthritis is a degenerative joint disease that causes the cartilage between bones to break down. It commonly affects joints in the hands, knees, hips, and spine. Symptoms of spinal osteoarthritis include back pain, stiffness, and weakness or paralysis in the arms or legs if nerves are affected. Treatments focus on pain management through exercises, maintaining a healthy weight, and lifestyle changes to improve flexibility and mobility. Risk factors include joint injuries, older age, obesity, bone deformities, and certain metabolic diseases.