Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Font Size

Understanding Juvenile Rheumatoid Arthritis -- the Basics

Types of Juvenile Rheumatoid Arthritis continued...

The main difference between juvenile and adult arthritis is that some children with JRA outgrow the illness, while adults usually have lifelong symptoms. Studies estimate that by adulthood, JRA symptoms disappear in more than half of all affected children. Additionally, unlike adult rheumatoid arthritis, JRA may affect bone development as well as the child's growth.

Another difference between JRA and adult rheumatoid arthritis is the percentage of people who are positive for rheumatoid factor in their blood. About 70% to 80% of all adults with rheumatoid arthritis have rheumatoid factor, but fewer than half of all children with rheumatoid arthritis are rheumatoid factor positive. The presence of rheumatoid factor indicates an increased chance that JRA will continue into adulthood.

WebMD Medical Reference

Reviewed by David Zelman, MD on February 27, 2015
1 | 2

Today on WebMD

rubbing hands
Avoid these 6 common mistakes.
mature couple exercising
Decrease pain, increase energy.
mature woman threading needle
How much do you know?
Swelling, fatigue, pain, and more.
Lucille Ball
Hand bones X-ray
prescription pills
Woman massaging her neck
woman roasting vegetables in oven
Woman rubbing shoulder
Working out with light weights