Viral Myalgia / Post-viral Fatigue

Other

Overview

Viral myalgia presents as diffuse muscle pain and fatigue during or following an acute viral illness (e.g. influenza, COVID-19, Ross River virus, EBV). Post-viral fatigue syndrome refers to persistent symptoms extending beyond the acute illness phase, sometimes overlapping with ME/CFS criteria.

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Medically Managed — Refer Early

This condition is primarily medically managed. Osteopathic care may play a supportive role — refer early if suspected.

Typical Presentation

Site

Diffuse, bilateral, often worse in limb girdle musculature

Quality

Deep aching, heaviness, fatigue-related pain worsening with exertion

Intensity

Variable; may be severe in acute phase, fluctuating in post-viral course

Aggravating

Physical or cognitive exertion, stress, disrupted sleep

Relieving

Rest, pacing, sleep, treatment of underlying illness

Associated

Fatigue, low-grade fever, malaise, headache, cognitive slowing

⚠ Red Flags

  • •High fever with severe myalgia and rigidity suggesting bacterial infection or meningitis
  • •Chest pain or dyspnoea with myalgia suggesting myocarditis
  • •Rhabdomyolysis signs (dark urine, extreme weakness)
  • •Focal neurological deficit suggesting encephalitis or CNS involvement

⚡ Yellow Flags

  • •Prolonged activity avoidance leading to significant deconditioning
  • •Illness identity and catastrophising impeding gradual return to activity
  • •Comorbid anxiety or health anxiety amplifying post-viral symptom burden

Referral Criteria

  • •GP referral for infectious disease workup if acute systemic features present
  • •Cardiology if chest symptoms or suspected myocarditis
  • •ME/CFS specialist or GP with interest in post-viral syndromes if symptoms persist beyond 3 months