Onset abrupt or subacute (weeks-months)
Proximal myalgia primarily of hip and shoulder girdles
Morning stiffness
Giant cell arteritis develops in approximately 15% of patients with<unk> 
+/- constitutional symptoms (fatigue/malaise, low-grade fever, anorexia)
+/- [[anemia
Rheumatoid arthritis-like symptoms (joint pain/swelling, degenerative changes) in 30% of patients
Polymyalgia rheumatica
Infection:
Fibromyalgia
Viral infection 
Systemic lupus erythematosus
Bacterial infection
Dermatomyositis
Spirochete infection 