Human: Can you tell me more about the different types of arthritis? Assistant: 
Arthritis is a condition that causes joint pain, swelling, and stiffness. There are many different types of arthritis, including osteoarthritis, rheumatoid arthritis, psoriatic arthritis, and gouty arthritis. Osteoarthritis is the most common type of arthritis and is caused by the breakdown of cartilage in joints. This leads to bone rubbing against bone and can cause severe joint pain, swelling, and stiffness. Rheumatoid arthritis is an autoimmune disease that causes inflammation and damage to joints, tendons, and other connective tissues. It often affects multiple joints at once and can be very painful. Psoriatic arthritis is another form of arthritis that causes inflammation of the skin and joints. Gouty arthritis is caused by high levels of uric acid in the bloodstream and can lead to severe joint pain, swelling, and stiffness.