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Long COVID (Post-Acute Sequelae of SARS-CoV-2)

Multisystem condition persisting beyond 12 weeks after acute COVID-19

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Internal Medicine department. Book Appointment →

What is Long COVID (Post-Acute Sequelae of SARS-CoV-2)?

Long COVID (post-acute sequelae of SARS-CoV-2 infection, PASC) describes persistent, new, or recurrent symptoms lasting more than 12 weeks after acute COVID-19 infection, affecting an estimated 10-30% of nonhospitalized and 50-70% of hospitalized patients. The condition is heterogeneous with proposed phenotypes including cardiopulmonary, neurocognitive, dysautonomic (including POTS), gastrointestinal, and chronic fatigue syndrome-like presentations.

Pathophysiology remains incompletely understood but involves persistent viral antigens (gut and tissue reservoirs), immune dysregulation and autoimmunity, microvascular dysfunction and microclots, mitochondrial dysfunction, dysautonomia, mast cell activation, and reactivation of latent viruses (EBV, HHV-6, CMV). Risk factors include severe acute illness, female sex, comorbidities, hospitalization, and Omicron variant infection lower risk than Delta.

Diagnosis is clinical and exclusion-based after ruling out alternative explanations. No specific biomarker or diagnostic test exists. Management is individualized, multidisciplinary, and rehabilitation-focused, addressing dominant phenotype with cardiopulmonary rehabilitation, vestibular rehabilitation, dysautonomia management, cognitive rehabilitation, mental health support, pacing strategies for postexertional malaise, and treatment of comorbid conditions. Vaccination reduces both acute COVID-19 severity and long COVID risk.

Symptoms

Persistent fatigue, often debilitating
Postexertional malaise (worsening after physical or cognitive exertion)
Dyspnea, breathlessness on exertion
Cognitive dysfunction (brain fog, memory, concentration, executive function)
Headache
Sleep disturbance, insomnia
Dysautonomia symptoms (palpitations, dizziness, postural orthostatic tachycardia)
Tachycardia, chest pain, palpitations
Loss of taste or smell (anosmia, parosmia, dysgeusia)
Cough, dyspnea
Joint and muscle pain
Gastrointestinal symptoms (diarrhea, constipation, abdominal pain)
Skin rash, urticaria
Hair loss
Menstrual irregularities
Erectile dysfunction
Depression, anxiety, post-traumatic stress
Hyposmia, parosmia
Neuropathy, paresthesias
Mast cell activation symptoms (flushing, urticaria, abdominal pain)

Risk Factors

Severe acute COVID-19 illness
Hospitalization or ICU admission
Female sex
Older age
Pre-existing conditions (asthma, autoimmune disease, diabetes)
Obesity
High initial viral load
Reinfection
Lack of vaccination at time of infection
Pre-Omicron variant infection (especially Delta)
Mental health history (depression, anxiety)
Connective tissue laxity (Ehlers-Danlos spectrum)
Smoking
Type A blood group (controversial)
Genetic predisposition (HLA, certain immune polymorphisms)
Prior reactivation of latent viruses (EBV)
Persistent viral antigen detection
Microclot formation
Endothelial dysfunction

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Persistent symptoms beyond 4 weeks after COVID-19
  • New symptoms appearing after acute COVID-19 recovery
  • Severe fatigue limiting daily function
  • Postexertional malaise
  • Dyspnea, chest pain, palpitations
  • Cognitive dysfunction affecting work or school
  • Persistent loss of taste or smell beyond 8 weeks
  • Dysautonomia symptoms (postural tachycardia, dizziness)
  • Mental health symptoms (depression, anxiety, PTSD)
  • Persistent gastrointestinal symptoms
  • New menstrual or sexual dysfunction
  • Quality-of-life impairment
  • Inability to return to baseline activities
  • Concerning cardiovascular or neurological symptoms

Treatment Methods

01
Comprehensive evaluation by primary care or long COVID clinic
02
Detailed history including acute COVID-19 timeline, vaccination status, prior conditions
03
Physical examination including orthostatic vital signs
04
Targeted workup based on dominant symptoms (CBC, CMP, TSH, vitamin B12, ferritin, iron studies, troponin, BNP, ECG, echocardiography, pulmonary function tests, chest imaging, cognitive testing)
05
Tilt-table testing or 10-minute stand test for POTS
06
Sleep study for sleep disorders
07
Mental health screening with PHQ-9, GAD-7, PCL-5
08
Multidisciplinary care including primary care, cardiology, pulmonology, neurology, rehabilitation medicine, mental health, and other specialists as indicated
09
Pacing strategies and energy conservation for postexertional malaise
10
Cardiopulmonary rehabilitation for dyspnea and deconditioning
11
Vestibular and balance therapy
12
Cognitive rehabilitation
13
Olfactory training for anosmia
14
POTS management with non-pharmacologic measures (compression stockings, increased salt and fluid, exercise) and medications (beta-blockers, ivabradine, fludrocortisone, midodrine)
15
Treat comorbid conditions (sleep apnea, asthma, depression, anxiety)
16
Selective serotonin reuptake inhibitors for depression and dysautonomia
17
Low-dose naltrexone (off-label, investigational)
18
Anti-inflammatory and immunomodulatory approaches under investigation
19
Apheresis or anticoagulation for microclot phenotype (controversial, investigational)
20
Nirmatrelvir/ritonavir during acute infection may reduce long COVID risk
21
Vaccination (may improve some symptoms in subset of patients)
22
Patient education and validation
23
Mental health support and peer groups
24
Lifestyle modifications (sleep hygiene, balanced nutrition, gradual exercise)
25
Disability accommodations and work modifications

Which Department to Visit?

You can visit our Enfeksiyon Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.