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Post-COVID Dysphagia: Long COVID Swallowing Difficulties and Recovery

The COVID-19 pandemic produced a new and substantial category of dysphagia patients. Post-COVID dysphagia encompasses two distinct clinical entities: post-critical-illness dysphagia from acute intubation and ICU management, and long COVID dysphagia from the prolonged neurological and muscular sequelae of COVID-19 infection. Both require SLT-led assessment and management, though their mechanisms, severity, and recovery trajectories differ.

This article follows ASHA Practice Portal guidance on adult dysphagia and NICE CG162.

Post-Critical-Illness Dysphagia (Post-Intubation)

Mechanism

Prolonged orotracheal intubation during ICU management for severe COVID-19 causes dysphagia through multiple mechanisms:

  1. Direct mucosal injury from the endotracheal tube — pressure necrosis of the posterior larynx, arytenoid cartilage dislocation, subglottic stenosis
  2. Laryngeal sensory impairment — intubation reduces sensory acuity in the laryngeal mucosa; this effect persists for weeks to months after extubation, blunting cough reflex and swallow trigger sensitivity
  3. Disuse weakness — the swallowing musculature is not exercised normally during nasogastric tube feeding in the ICU, producing deconditioning of swallowing muscles compounding systemic critical illness myopathy
  4. Reduced respiratory muscle strength — diaphragm and intercostal weakness from ICU myopathy impairs the cough force available to clear aspirated material
  5. Cognitive effects of prolonged sedation — emergence from sedation with delirium, PTSD-related hypervigilance, or ICU-acquired weakness affecting voluntary swallowing control

COVID-19 specifically also caused vocal cord granulomas and subglottic granulation tissue from the high PEEP ventilation strategies commonly used, producing a distinctive post-extubation stridor and dysphagia pattern.

Prevalence

Post-extubation dysphagia was identified in 50–90% of prolonged COVID-19 ICU patients in multiple international case series, significantly higher than pre-pandemic post-extubation dysphagia rates in general ICU cohorts (~30%). This likely reflects both the prolonged duration of intubation in severe COVID-19 and the specific laryngeal injury patterns.

Recovery

Most post-intubation dysphagia improves significantly within 4–8 weeks with SLT-led management. A minority of patients — particularly those with structural laryngeal injury, vocal cord palsy, or subglottic stenosis — have longer recovery trajectories and may require ENT surgical intervention.

Long COVID Dysphagia

Mechanism

Dysphagia in long COVID (post-acute sequelae of SARS-CoV-2 infection, PASC) affects patients who were never critically ill — including those who had mild initial infections. Proposed mechanisms include:

Clinical Features

Long COVID dysphagia presents with a variable combination of:

Many long COVID patients report dysphagia as one symptom within a broader syndrome including breathlessness, cognitive fog, fatigue, and autonomic symptoms.

Assessment in Post-COVID Patients

History

Key questions:

Clinical Assessment

Oropharyngeal status may show:

Instrumental Assessment

FEES is often preferred over VFSS in post-COVID patients because:

The HKU Swallowing Research Lab (Prof. Karen Chan) contributed to regional guidelines for managing post-COVID dysphagia in the Asia-Pacific context during the pandemic, including recommendations for FEES-based triage of post-extubation patients in Hong Kong public hospitals.

Management

IDDSI Modification

The IDDSI framework guides safe dietary modification during the recovery phase. For most post-critical-illness dysphagia patients, initial management often involves IDDSI Level 2 (Mildly Thick) or Level 3 (Moderately Thick) liquids, with step-up to thin liquids (Level 0) as swallowing function recovers and is confirmed safe on re-assessment.

Swallowing Rehabilitation

Management of Anosmia/Ageusia

Where taste and smell disturbance is present, olfactory training (systematic exposure to reference smells twice daily) has level 2 evidence for improving olfactory recovery. As taste and smell improve, oral intake often simultaneously improves. Strong-flavoured, appealing foods may facilitate better swallowing reflex triggering.

Respiratory Coordination

Given COVID-19 pulmonary sequelae, attention to breathing-swallowing coordination is important. Some patients with post-COVID respiratory failure have profoundly altered respiratory patterns that interfere with swallowing apnoea. A physiotherapy-SLT joint assessment may be warranted in complex cases.

Recovery Trajectory

Most post-intubation dysphagia resolves within weeks to months with appropriate SLT management. Long COVID dysphagia follows a more variable trajectory, with some patients recovering within 6 months and others reporting persistent difficulties at 12–18 months. Predictors of poorer recovery include more severe initial COVID-19 illness, older age, and significant comorbidities.

When to Refer

Any patient with persistent coughing or choking after COVID-19, wet voice, or unexplained weight loss following COVID-19 illness should be referred for SLT assessment. See When to Refer to a Speech and Language Therapist.

References

  1. American Speech-Language-Hearing Association. Adult Dysphagia Practice Portal. https://www.asha.org/practice-portal/clinical-topics/adult-dysphagia/
  2. National Institute for Health and Care Excellence. Stroke Rehabilitation in Adults (CG162). https://www.nice.org.uk/guidance/cg162
  3. IDDSI. The IDDSI Framework. https://www.iddsi.org/framework
  4. Logemann JA, et al. (2015). Disorders of deglutition. Handbook of Clinical Neurology, 129, 465–487. PMID: 26315994