Sneezing

What is it?

Sneezing is a protective reflex that clears the nasal passages of irritants and pathogens. It is mediated by the trigeminal nerve (V1/V2) and orchestrated by the "sneeze center" in the brainstem. Allergic rhinitis (hay fever) is the most common cause of recurrent sneezing — typically seasonal with itchy eyes, clear rhinorrhea, and nasal congestion. Viral upper respiratory infections (common cold) cause self-limited sneezing with nasal congestion and sore throat. Non-allergic rhinitis (vasomotor rhinitis) is triggered by temperature changes, strong odors, and spicy foods without IgE-mediated mechanism. The photic sneeze reflex (ACHOO syndrome) affects 18–35% of the population — bright light triggers sneezing, especially upon walking into sunlight.

Common causes

When to see a doctor

• 1Sneezing with thick green or yellow nasal discharge lasting more than 10 days — possible sinusitis
• 2Sneezing with facial pain, fever, and headache — evaluate for acute bacterial sinusitis
• 3Severe sneezing that significantly impairs quality of life despite OTC antihistamines
• 4Sneezing with nasal polyps or significantly reduced sense of smell — ENT evaluation
• 5Sneezing in a child with unilateral foul-smelling discharge — foreign body in the nose

What you can do

• ✓Identify and avoid allergen triggers — keep windows closed during high pollen counts
• ✓Use HEPA air purifiers in the bedroom to reduce indoor allergen load
• ✓Shower after outdoor activities during allergy season to remove pollen from hair and skin
• ✓Nasal saline irrigation (neti pot) reduces allergen load in the nasal mucosa
• ✓Start intranasal corticosteroid sprays 1–2 weeks before allergy season for maximum effect

Conditions that cause this symptom

Medications that may help

Treatment depends on the underlying cause. Always consult your provider before starting any medication.

Frequently asked questions