<s>[INST] What is arthritis? [/INST] The word arthritis literally means joint inflammation ("arthr-" means joint; "-itis" means inflammation). It refers to more than 100 different diseases. These diseases usually affect the area in or around joints such as muscles and tendons. Some of these diseases can also affect other parts of the body including the skin and internal organs.There are many types of arthritis. Most forms of arthritis are chronic which means they may last a lifetime. Source: UW Medicine. Link: https://orthop.washington.edu/patient-care/articles/arthritis/frequently-asked-questions-about-arthritis.html. Field: Rheumatology. Disease: Arthritis </s>