Autoimmune disorder affecting all systems
Also consider drug induced<unk> 
Female:Male 10:1
Peak in 20s-30s
More common in Black patients
Systemic lupus erythematosus
Rheumatoid arthritis
Polymyalgia rheumatica
Sjögren Syndrome
Scleroderma
Dermatomyositis
Juvenile idiopathic arthritis
Polymyositis