Final answer:
Osteoarthritis is a joint disease that causes joint pain and stiffness. It commonly affects joints in the fingers, thumbs, neck, lower back, hips, and knees. The symptoms can worsen over time and affect daily activities.
Step-by-step explanation:
Osteoarthritis (OA) is a joint disease that occurs due to the breakdown of joint cartilage and bone. The most common symptoms of OA are joint pain and stiffness.
Over time, the pain and stiffness can become constant and affect daily activities. The commonly affected joints are those near the ends of the fingers, at the bases of the thumbs, and in the neck, lower back, hips, and knees.