InfectiousICD-10: U09.9An estimated 65 million people worldwide have experienced Long COVID

Long COVID

Also known as: Post-COVID Conditions, Post-Acute Sequelae of SARS-CoV-2, PASC

Long COVID refers to new, returning, or ongoing health problems persisting four or more weeks after SARS-CoV-2 infection. It can affect anyone, including those with mild initial illness. Symptoms are wide-ranging, affect multiple organ systems, and can significantly impact daily functioning.

Symptoms

Persistent fatigue not improved by rest
Post-exertional malaise (symptom worsening after effort)
Brain fog, difficulty concentrating, memory problems
Shortness of breath
Persistent cough
Heart palpitations and chest pain
Joint and muscle pain
Sleep disturbances
Loss or change in smell and taste
Dizziness upon standing (orthostatic intolerance)

Causes

  • Persistent viral reservoirs in body tissues
  • Autoimmune responses triggered by SARS-CoV-2
  • Chronic inflammation and immune dysregulation
  • Microclots and endothelial damage
  • Reactivation of latent viruses (e.g., Epstein-Barr)
  • Gut microbiome disruption

Risk Factors

  • Severe initial COVID-19 illness
  • Female sex
  • Pre-existing chronic conditions
  • Not being vaccinated against COVID-19
  • Reinfection with SARS-CoV-2

Diagnosis

  • Clinical diagnosis based on persistent symptoms ≥4 weeks after COVID-19
  • Exclusion of other conditions
  • Blood tests to rule out thyroid disease, anemia, and other causes
  • Pulmonary function tests if respiratory symptoms are prominent
  • Cardiac evaluation for cardiovascular symptoms

Treatment

  • Symptom-based management tailored to each patient
  • Pacing and energy management for fatigue
  • Graded rehabilitation programs
  • Medications for specific symptoms (beta-blockers for POTS, low-dose naltrexone)
  • Cognitive behavioral therapy and mental health support
  • Multidisciplinary Long COVID clinic referral

Prevention

  • COVID-19 vaccination reduces Long COVID risk
  • Early antiviral treatment during acute infection may reduce risk
  • Continue practicing good respiratory hygiene

When to See a Doctor

  • COVID-19 symptoms persist or worsen beyond 4 weeks
  • New symptoms develop weeks or months after infection
  • Fatigue, brain fog, or breathlessness prevents functioning
  • You experience chest pain, palpitations, or fainting

Frequently Asked Questions

Related Conditions

Influenza

Infectious

Chronic Fatigue Syndrome

Neurological

Fibromyalgia

Musculoskeletal

Insomnia

Mental Health

Related from the Supplement Library

NAC (N-Acetyl Cysteine)

Strong

Amino Acid · Glutathione precursor and antioxidant support

Omega-3 (EPA/DHA)

Strong

Fatty Acid · Cardiovascular health (TG reduction, anti-arrhythmic)

Vitamin D

Strong

Vitamin · Bone health and calcium absorption

CoQ10 (Ubiquinone)

Strong

Compound · Mitochondrial energy production (ATP)

Probiotics (Lactobacillus)

Strong

Probiotic · Gut microbiome balance and diversity

These supplements have been studied in relation to Long COVID. Always consult your healthcare provider before starting any supplement, especially if you take medications.

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Medical Disclaimer: This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.

Content reviewed against peer-reviewed medical literature and clinical guidelines. Read our editorial standards.