Answer
Arthritis is a disorder that causes pain, stiffness, and swelling of the joints. It can affect people of all ages, but it is most common in older adults. There are many different types of arthritis, but the most common are osteoarthritis, rheumatoid arthritis, and psoriatic arthritis. Symptoms can include joint pain, stiffness, swelling, warmth, redness, and a decreased range of motion.