What is Juvenile

Juvenile myositis is a rare autoimmune disease in which the body’s immune system attacks its own cells and tissues. Your doctor may refer to juvenile myositis as juvenile dermatomyositis or JDM. Juvenile dermatomyositis is the most common form of the disease.


Juvenile myositis affects each child differently as the immune system typically attacks muscle and skin, resulting in significant and sometimes severe weakness and persistent rash. The exact cause of JM is unknown. Current treatments are imperfect, yet most children diagnosed today go on to live their best lives.  Our work is to help make the road to their best life easier, so they can get back to being kids again faster.

Two young girls hold a Cure JM ballon.
Approximately 2 to 4 children per million are diagnosed with JM yearly in the U.S.
The average age of onset for JDM is between six to seven years old; 25% are age four or younger
JDM affects girls twice as often as it affects boys

What is Juvenile Myositis?

Juvenile myositis, including juvenile dermatomyositis and juvenile polymyositis, is a group of rare and life-threatening autoimmune diseases, in which the body’s immune system attacks its

Myositis and You Book Cover

Myositis and You

This comprehensive guide features over 450 pages with contributions from over 80 experts and medical professionals.

Receive a free digital copy when you join Cure JM here.

  • Learn what juvenile myositis is and how to explain it to children
  • Understand the symptoms of JM, tests used to diagnose it, and how to find medical help
  • Find strategies to help your child adjust to physical limitations and to cope with JM as a family

Interested in DIY fundraising but need help?

We’re here to help!

To have your fundraiser matched, add “DIY Match” in the memo of your online gift or check.