Osteoarthritis is the most common type of arthritis, affecting more than 21 million Americans. Osteoarthritis is usually diagnosed in people older than 40. Nearly everyone over 70 has osteoarthritis in at least one joint, but not all develop symptoms. There are many other types of rheumatic disorders. Not all of them are primarily diagnosed in adults.
Juvenile arthritis is the name of a group of arthritis-related conditions that affect children.
You can reduce your risk for developing symptomatic osteoarthritis by maintaining a normal weight. If you're already overweight, losing just 10 or 11 pounds will significantly reduce your risk for developing osteoarthritis in your knees. See your doctor if you suspect you have arthritis, and especially if you have pain and stiffness in a joint. Tell your doctor if you have swelling in or around the joint. Your doctor will find it easier to give you an accurate diagnosis if you describe your symptoms clearly.