DDx

Rheumatological

• PMR - Polymyalgia rheumatica
• Some types of Inflammatory Myositis (although predominantly it is proximal muscle weakness without pain)

Metabolic

• !Hypercalcemia - ↑Ca (> 2.5)

Malignancy

• MM - Multiple Myeloma
• BONE Metastasis

Endocrine

• Hypothyroidism ↓
• Hyperparathyroidism ↑

Viral

• Part of the Flu-like Symptoms

Neurological