Facial Swelling: Differential Diagnosis and When to Seek Emergency Care

Facial swelling (angioedema or localized edema) has diverse etiologies ranging from benign to life-threatening. Rapid recognition of red flags directs appropriate urgency.

Common Causes by Category

Allergic / Immunologic

• Acute Allergic Angioedema: Food, drug, venom, latex. Often with urticaria. Rapid onset (minutes-hours).
• Hereditary/Acquired C1 Inhibitor Deficiency (HAE/AAE): Non-pruritic, non-pitting swelling without urticaria; recurrent; laryngeal involvement risk. Family history (HAE).
• ACE Inhibitor–Induced Angioedema: Bradykinin-mediated; can occur years after initiation; no urticaria; lip/tongue/face predominant.

Infectious / Inflammatory

• Dental/Odontogenic: Periapical abscess, pericoronitis → unilateral jaw/cheek swelling, pain, trismus, fever.
• Sinusitis: Periorbital/cheek swelling with purulent discharge, fever, pain.
• Cellulitis/Erysipelas: Spreading erythema, warmth, tenderness; often post-trauma/surgical.
• Orbital Cellulitis: Proptosis, ophthalmoplegia, vision changes—emergency.
• Salivary Gland Infection (Sialadenitis): Parotid/submandibular swelling, pain with meals, purulent duct expression.

Trauma / Structural

• Fractures (nasal, zygomatic, mandibular): ecchymosis, deformity, malocclusion, step-off.
• Soft tissue contusion/hematoma.
• Post-surgical edema (expected, peaks 48–72 hrs).

Ocular

• Conjunctivitis (allergic, viral, bacterial): eyelid edema, injection, discharge.
• Chalazion/hordeolum (stye): localized eyelid nodule.
• Dacryocystitis: medial canthus swelling, pain, reflux.

Systemic / Medical

• Hypothyroidism (Myxedema): Non-pitting periorbital/facial puffiness, cold intolerance, fatigue.
• Nephrotic Syndrome / CKD / Heart Failure / Cirrhosis: Generalized edema + facial (especially periorbital, worse AM).
• Superior Vena Cava Syndrome: Facial/neck/arm swelling, distended veins, dyspnea—oncologic emergency.
• Pre-eclampsia: New-onset facial/hand edema in pregnancy + hypertension/proteinuria.

Medication-Induced

• ACE inhibitors (angioedema)
• NSAIDs (angioedema in susceptible)
• Corticosteroids (moon facies with chronic use)
• Calcium channel blockers (peripheral edema)

Red Flags: Seek Emergency Care Immediately

• Difficulty breathing, stridor, drooling, tongue/lip swelling progressing rapidly
• Voice change, inability to swallow secretions
• Syncope, hypotension, confusion
• Vision changes, ophthalmoplegia, proptosis
• Unilateral swelling with fever/severe pain (deep space infection)

Initial Evaluation

• History: onset, progression, triggers, medications, comorbidities, family history.
• Exam: airway patency, skin (urticaria?), ocular mobility, dental, neck veins.
• Labs: C4, C1q, C1-INH function/level (if HAE suspected); TSH; renal/hepatic panel; CBC; CRP.
• Imaging: CT face/neck if deep space infection, fracture, or SVC syndrome suspected.

Airway compromise is the paramount concern. Epinephrine for allergic/idiopathic angioedema; icatibant/C1-INH concentrate for HAE; do NOT give epinephrine for ACEi angioedema (ineffective) but secure airway.