Ludwig's angina is a rapidly progressive, potentially fatal bilateral cellulitis of the sublingual and submandibular spaces, most commonly of odontogenic origin, with the primary threat being airway obstruction from posterior tongue displacement. [1-2] Mortality has decreased from >50% in the pre-antibiotic era to approximately 8%, but it remains a true surgical emergency. [1][3]
1. History
- Onset and progression: Rapid onset (hours to days) of neck swelling, floor-of-mouth pain, and dysphagia; ask about speed of progression — this infection escalates quickly [2]
- Dental history: Recent dental infection, extraction, procedure, or toothache — odontogenic source in ~90% of cases (classically 2nd and 3rd lower molars) [4-6]
- Symptom characterization: Severe neck pain, bilateral submandibular swelling, dysphagia, odynophagia, drooling, "hot potato" voice/dysphonia, fever, malaise [7-8]
- Airway symptoms: Ask specifically about difficulty breathing, positional dyspnea (worse supine), voice changes, and inability to handle secretions [2]
- Important negatives: Absence of stridor does not rule out impending airway compromise; trismus is a late finding suggesting advanced disease [2]
2. Alarm Features
- Stridor — suggests impending airway crisis [8]
- Inability to swallow secretions / drooling [7]
- Rapidly expanding neck swelling ("bull neck")
- Trismus — late finding indicating severe disease [2]
- Respiratory distress, tachypnea, use of accessory muscles [9]
- Dysphonia or muffled voice [7]
- Inability to lie supine — critical sign of airway compromise
- Signs of sepsis: fever, tachycardia, hypotension
- Chest pain or pleuritic symptoms — may indicate descending mediastinitis [6][10]
3. Medications
- Empiric IV antibiotics (broad-spectrum covering streptococci, staphylococci, gram-negatives, and anaerobes):
- Ampicillin-sulbactam 3 g IV q6h — commonly used first-line [11]
- Penicillin G + clindamycin — classic combination [3][5]
- Piperacillin-tazobactam or meropenem for immunocompromised or critically ill patients
- Add vancomycin if MRSA risk factors present [11]
- Dexamethasone — adjunctive use is controversial; may reduce edema and potentially decrease need for airway intervention, but evidence is limited to case reports. All reported cases used steroids alongside antibiotics and most still required surgery [12]
- NSAIDs should be avoided — associated with worsening necrotizing cervical cellulitis in case series [13]
- Avoid oral antibiotics alone — conservative management with IV antibiotics alone carries a risk of airway compromise nearly 10 times higher than early surgical drainage (26.3% vs. 2.9%) [1]
4. Diet
- NPO in the acute setting — anticipate airway intervention and/or surgical drainage
- Severe dysphagia and trismus typically preclude oral intake
- IV fluid resuscitation and nutritional support as needed
- Transition to soft/liquid diet as swelling resolves and swallowing function returns
5. Review of Systems
- HEENT: Dental pain, jaw stiffness, ear pain, sore throat, voice changes, drooling
- Respiratory: Dyspnea, stridor, positional breathing difficulty, cough
- Constitutional: Fever, chills, rigors, malaise, night sweats
- GI: Dysphagia, odynophagia, inability to eat/drink
- Cardiovascular: Chest pain (mediastinal extension), palpitations
- Neurologic: Altered mental status (sepsis), headache (intracranial extension — rare) [7]
6. Collateral History and Family History
- Dental care history: Last dental visit, known caries, prior dental infections or extractions
- Recent oral procedures or trauma to the oral cavity [1]
- Medication history: Recent antibiotic use (may mask early symptoms), NSAID use (associated with worse outcomes), antipsychotic use (may mask pain and impair self-care) [13-14]
- Social history: Alcohol use disorder, IV drug use, homelessness, malnutrition — all increase risk [7]
- Family history is generally not contributory, though familial immunodeficiency conditions may be relevant
7. Risk Factors
- Poor dentition / dental caries — most important risk factor [2][5]
- Diabetes mellitus — present in ~38% of patients in large series [5]
- Immunosuppression: HIV/AIDS, malignancy, chemotherapy, chronic steroid use [1][7]
- Alcohol use disorder [7]
- Malnutrition [7]
- Obesity — may contribute to airway compromise [14]
- Recent dental procedures [1]
- Low socioeconomic status / limited access to dental care [15]
- Delayed treatment of dental infections (notably increased during COVID-19 pandemic) [15]
8. Differential Diagnosis
- Peritonsillar abscess — typically unilateral, uvular deviation, trismus; does not involve floor of mouth bilaterally
- Parapharyngeal abscess — unilateral neck swelling, medial displacement of tonsil/lateral pharyngeal wall
- Retropharyngeal abscess — posterior pharyngeal wall swelling, neck stiffness, dysphagia; more common in children
- Submandibular abscess (unilateral) — localized fluctuance without bilateral floor-of-mouth involvement
- Angioedema — non-tender, non-erythematous swelling; no fever; may have urticaria; medication history (ACE inhibitors)
- Salivary gland infection (sialadenitis/sialolithiasis) — unilateral, gland-specific swelling, worsens with eating
- Cervical lymphadenitis — discrete, tender lymph nodes without diffuse induration
- Epiglottitis — sore throat, drooling, muffled voice, but no submandibular swelling
- Necrotizing fasciitis of the neck — may overlap with or complicate Ludwig's angina; crepitus, skin necrosis [13][15]
- Oral/oropharyngeal malignancy — subacute course, weight loss, risk factors
9. Past Medical History
- Prior episodes of dental infection or deep neck space infection
- Diabetes mellitus — screen if not previously diagnosed [5]
- Immunocompromising conditions
- Prior head/neck surgery or radiation
- Mandibular fractures [1]
- Chronic medical conditions affecting wound healing
10. Physical Exam
- Vital signs: Fever, tachycardia, tachypnea; hypotension suggests sepsis
- General: Toxic-appearing, may be sitting upright and leaning forward ("tripod" or "sniffing" position), drooling
- Neck: Bilateral submandibular and submental brawny induration (woody, non-fluctuant) — hallmark finding [1][4]
- Floor of mouth: Elevated, tender, indurated — tongue is displaced posteriorly and superiorly [1]
- Tongue protrusion beyond the teeth [7]
- Trismus — late finding, indicates severe disease [2]
- Oropharynx: Erythematous, edematous; assess for dental caries, periapical abscess
- Airway assessment: Voice quality, stridor, ability to handle secretions, Mallampati score (likely distorted)
- Skin: Overlying erythema, warmth; crepitus suggests gas-forming organisms or necrotizing fasciitis
- Cervical lymphadenopathy may be present
11. Lab Studies
- CBC with differential: Leukocytosis with left shift expected
- CRP / ESR: Elevated inflammatory markers
- BMP: Assess renal function, glucose (screen for diabetes)
- Lactate: If sepsis suspected
- Blood cultures: Obtain before antibiotics if possible
- Wound/abscess cultures (aerobic and anaerobic): Obtain at time of surgical drainage — most common organisms are Streptococcus spp., Staphylococcus spp., and mixed anaerobes [4][7]
- Coagulation studies: If surgical intervention anticipated
- Procalcitonin: May help guide antibiotic duration
12. Imaging
- CT neck with IV contrast — preferred first-line imaging if the patient can safely leave the ED and tolerate lying supine [2]
- Delineates extent of infection across fascial spaces
- Identifies drainable abscess collections
- Evaluates for parapharyngeal, retropharyngeal, and mediastinal extension
- Point-of-care ultrasound (POCUS) — useful adjunct, especially in patients who cannot tolerate lying supine. The floor-of-mouth ultrasound (FOMUS) protocol using linear and curvilinear probes can assess submandibular collections [2][16]
- CT chest — if concern for descending mediastinitis or pleural empyema [6-7]
- Panoramic dental radiograph (Panorex) — may identify offending tooth
- Imaging is NOT required to initiate treatment — Ludwig's angina is a clinical diagnosis; do not delay airway management for imaging [17]
13. Special Tests
- Flexible nasopharyngoscopy — assess supraglottic edema and airway patency (if available and safe)
References
1. Acute Upper Airway Obstruction. — Eskander A, de Almeida JR, Irish JC. The New England Journal of Medicine. 2019.
2. Diagnosis and Management of Ludwig's Angina: An Evidence-Based Review. — Bridwell R, Gottlieb M, Koyfman A, Long B. The American Journal of Emergency Medicine. 2021.
3. Ludwig's Angina: An Update. — Patterson HC, Kelly JH, Strome M. The Laryngoscope. 1982.
4. Ludwig's Angina: A Clinical Review. — Srirompotong S, Art-Smart T. European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies : Affiliated With the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery. 2003.
5. Management of Ludwig's Angina With Small Neck Incisions: 18 Years Experience. — Bross-Soriano D, Arrieta-Gómez JR, Prado-Calleros H, Schimelmitz-Idi J, Jorba-Basave S. Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery. 2004.
6. Ludwig's Angina. — Fritsch DE, Klein DG. Heart & Lung : The Journal of Critical Care. 1992.
7. Ludwig's Angina and a Complicated Course of Streptococcus Constellatus Management. — Distler K, Hammad A, Ryder E, Pokharel S. Journal of Intensive Care Medicine. 2025.
8. Ludwig's Angina in Children. — Hartmann RW. American Family Physician. 1999.
9. Case Report: Ludwig's Angina - 'The Dangerous Space'. — Vasanth S, Chandran S, Pandyan DA, et al. F1000Research. 2024.
10. Ludwig Angina: A Disease of the Past Century. Case Report. — Doldo G, Albanese I, Macheda S, Caminiti G. Minerva Anestesiologica. 2001.
11. Salivary Gland Disorders: Rapid Evidence Review. — Kim MJ, Milliren A, Gerold DJ. American Family Physician. 2024.
12. Ludwig's Angina and Steroid Use: A Narrative Review. — Tami A, Othman S, Sudhakar A, McKinnon BJ. American Journal of Otolaryngology. 2020.
13. Ludwig's Angina: A Diagnostic and Surgical Priority. — Vallée M, Gaborit B, Meyer J, et al. International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases. 2020.
14. Fatal Airway Obstruction Due to Ludwig's Angina From Severe Odontogenic Infection During Antipsychotic Medication: A Case Report and a Literature Review. — Yamaguchi R, Sakurada K, Saitoh H, et al. Journal of Forensic Sciences. 2021.
15. Ludwig's Angina: Higher Incidence and Worse Outcomes Associated With the Onset of the Coronavirus Disease 2019 Pandemic. — Canas M, Fonseca R, De Filippis A, et al. Surgical Infections. 2023.
16. Floor of the Mouth Ultrasound Assessment in Ludwig's Angina. — Okonkwo N, Montoya K, Shokoohi H. The Journal of Emergency Medicine. 2025.
17. Ludwig Angina After First Aid Treatment: Possible Etiologies and Prevention-Case Report. — Shemesh A, Yitzhak A, Ben Itzhak J, Azizi H, Solomonov M. Journal of Endodontics. 2019.