How should I manage throat swelling in infectious mononucleosis?

Management of Throat Swelling in Infectious Mononucleosis

For throat swelling in infectious mononucleosis, provide supportive care with ibuprofen or paracetamol for symptom relief, and reserve corticosteroids for severe cases with upper airway obstruction; acute tonsillectomy should be considered when corticosteroids fail to improve airway compromise. 1, 2, 3

Severity Assessment

First, determine if upper airway obstruction (UAO) is present by assessing:

• Difficulty breathing or shortness of breath 4
• Stridor or respiratory distress
• "Kissing tonsils" (tonsils meeting in midline) 4
• Inability to swallow secretions 2

Patients with UAO represent a distinct subgroup with more severe disease requiring aggressive intervention 2, 3.

Initial Management

For Mild to Moderate Throat Swelling (No Airway Compromise)

• Symptomatic relief: Administer ibuprofen or paracetamol for pain control 1
• Supportive care: Bed rest as tolerated and activity reduction 5, 6
• Avoid contact sports for 8 weeks or while splenomegaly persists due to rupture risk 5, 6
• Do NOT routinely use corticosteroids in uncomplicated cases 6

The evidence shows that a single dose of dexamethasone (0.3 mg/kg, maximum 15 mg) provides only short-lived pain relief at 12 hours in children with suspected infectious mononucleosis, with no sustained benefit beyond that timeframe 7. A Cochrane review found insufficient evidence to recommend routine steroid use for symptom control, and two trials reported severe complications in steroid-treated patients 8.

For Severe Throat Swelling with Upper Airway Obstruction

Step 1: Administer intravenous corticosteroids immediately 4

• Symptoms typically improve rapidly with IV steroids 4
• Monitor closely for response within 12-24 hours 3

Step 2: If minimal improvement with corticosteroids, proceed to acute tonsillectomy 2, 3

• In one series, 89% (8 of 9 patients) with UAO required tonsillectomy 2
• Another study found 6 of 15 patients with severe disease unresponsive to corticosteroids underwent successful acute tonsillectomy without significant complications 3
• Acute tonsillectomy averts immediate respiratory obstruction risk and may decrease subsequent recurrent tonsillitis morbidity 3

Important Caveats

• Corticosteroids are NOT routinely recommended for general symptom control in infectious mononucleosis 1, 6
• Emergency tracheostomy has been advocated historically but acute tonsillectomy is the preferred definitive intervention for steroid-refractory UAO 3
• Patients with UAO are at higher risk for recurrent tonsillitis: 3 additional patients who initially received corticosteroids required later elective tonsillectomy in one series 3
• Recurrent tonsillitis is uncommon after severe infectious mononucleosis pharyngotonsillitis WITHOUT UAO (only 16% required later tonsillectomy) 2

Monitoring

• Counsel all patients about potentially life-threatening airway obstruction as a rare complication 4
• Advise patients to return immediately if breathing difficulty develops 4
• Most patients have uneventful recovery with supportive care alone 5, 6