What Is Polymyositis?

What Is Poly-myositis? Usually it develops gradually and affects people over 18 years of age, with the primary characteristic being muscle weakness. Learn more about polymyositis. READ NOW  READ THESE NEXT What Causes Muscle Pain? MORE 10 Important Things to Know About Fibromyalgia MORE Polymyositis Is One of Three Conditions in Mixed Connective Tissue Disease MORE AN ABOUT.COM BRAND You are receiving this newsletter because you subscribed to the Real Life with Arthritis newsletter. If you wish to unsubscribe, please click here 1500 Broadway, 6th Floor, New York, NY, 10036 © 2017 Verywell.com - All rights reserved. Privacy Policy.