Arthritis is a general term that refers to inflammation of the joints, which can result in pain, stiffness, swelling, and decreased range of motion. There are over 100 different types of arthritis, with osteoarthritis and rheumatoid arthritis being the most common. While arthritis can affect people of all ages, it is more prevalent in older adults. Treatment options vary and may include medication, physical therapy, and lifestyle changes to manage symptoms and improve joint function.