Medical and Health Care

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Muscle Pain (Myalgia)

Causes

Viral illness (influenza/COVID)

Autoimmune myositis

Hypothyroidism

Rhabdomyolysis

Fibromyalgia

Electrolyte depletion (low Mg/K/Ca)

Investigations

First-level

CK (muscle breakdown)

ESR/CRP

TFT

U&E, Ca, Mg

Vitamin D

FBC

Second-line

Myositis antibody panel

Aldolase

Urine myoglobin (if rhabdomyolysis suspected)

Critical Emergency

CK >10,000 + dark urine → rhabdomyolysis → fluids STAT