Joint disease, also known as arthritis, encompasses a variety of conditions that affect the joints in the body. These conditions can cause pain, stiffness, swelling, and decreased range of motion in the affected joints. There are many different types of joint disease, including osteoarthritis, rheumatoid arthritis, gout, and juvenile arthritis, among others. Joint disease can be caused by a variety of factors, including genetics, aging, injury, and immune system dysfunction. Treatment for joint disease often includes medications, physical therapy, lifestyle changes, and in some cases, surgery. Researchers continue to study joint disease in order to better understand its causes and develop more effective treatments for those who suffer from these conditions.