Rheumatology is a medical specialty that focuses on the diagnosis and treatment of diseases of the musculoskeletal system, that is to say, bone diseases, joints, muscles, tendons and ligaments. It is a recent medical specialty that is dedicated to the study of very old diseases: from joint discomfort (osteoporosis, osteoarthritis, back pain) to severe disabilities (rheumatoid arthritis, lupus, ankylosing spondylitis).