Hives After a Cold: Five Potential Triggers and Management

Post-viral urticaria (hives) can occur during or after a cold. Five common triggers:

1. Medication Reaction

• NSAIDs, antibiotics, decongestants taken for cold symptoms
• Action: Stop suspect drug; contact prescriber; antihistamine for symptoms

2. Viral Trigger

• Immune response to cold virus (rhinovirus, coronavirus, etc.) releases histamine
• EBV, hepatitis, HIV can also cause urticaria
• Typically self-limited as infection clears

3. Exercise-Induced (Cholinergic Urticaria)

• Warming up during/after exercise with cold → hives
• Cold air dries airways/skin → hyperreactivity
• Premedicate with non-sedating antihistamine if recurrent

4. Environmental Allergens

• Cold weather → indoor allergen concentration (dust mite, pet dander, mold)
• Cold-induced histamine release (cold urticaria – distinct condition)

5. Stress Amplification

• Illness stress → cortisol → mast cell activation
• Sleep deprivation from cold symptoms lowers threshold

Management

• Second-generation antihistamine (cetirizine, loratadine, fexofenadine) daily
• Cool compresses, loose clothing, fragrance-free moisturizer
• If >6 weeks → chronic urticaria workup (allergist/immunologist)
• Angioedema (lip/tongue swelling) or dyspnea → ER immediately