A group of conditions that cause inflammation, structural changes, or other disease processes affecting one or more joints.
Arthritis is not a single disease. Different types have different causes and mechanisms, including osteoarthritis, rheumatoid arthritis, gout, and others. Symptoms can include joint pain, stiffness, swelling, reduced movement, and changes in joint function.
Some forms primarily involve wear and structural changes, while others are driven by inflammation or abnormal immune activity.
QUICK FACT
Arthritis can affect people of different ages; it is not simply a disease of old age.
COMMONLY CONFUSED WITH
Arthralgia: joint pain without necessarily establishing that arthritis or another joint disease is present.
SEE ALSO
