Idiopathic Inflammatory Myositis (IIM), or myositis, is a group of chronic autoimmune diseases causing muscle inflammation and weakness. The immune system attacks muscles, blood vessels, and organs. Main types include:
Dermatomyositis (DM)
Muscle weakness with a skin rash
IMNM
Rapid muscle cell damage causing severe weakness
ASyS
Myositis with lung disease, joint pain, fever, Raynaud’s, and “mechanic’s hands”
IBM
Progressive weakness in hands, forearms, and thighs, mainly in people over 50
