There are over 100 different types of arthritis, affecting people of all ages, races, and genders. It is the leading cause of disability in the United States, and can be mild, moderate, or severe. Some types of arthritis come and go, while others are chronic and progress or become worse over time. Some types of arthritis can impact not just the joints, but also the heart, eyes, skin, lungs, and kidneys. There is no way to completely prevent arthritis, but there are ways to lower your risk.