Runny Nose

Rhinorrhea

Mild severity85% reported by patientsICD-10: R09.89

Summary

Excess mucus discharge from the nasal passages, commonly caused by infections, allergies, or irritants.

What is it?

Rhinorrhea occurs when nasal mucous membranes produce excess secretions in response to infection, allergen exposure, irritants, or autonomic triggers. Viral upper respiratory infections are the most common cause. Allergic rhinitis produces clear, watery discharge triggered by seasonal or perennial allergens. Unilateral clear discharge, especially after head trauma, may rarely represent cerebrospinal fluid leakage and warrants urgent evaluation.

Common causes

Infectious

  • Common cold (rhinovirus)
  • Influenza
  • Sinusitis
  • COVID-19

Allergic

  • Seasonal allergic rhinitis (pollen)
  • Perennial allergens (dust mites, pet dander, mold)

Non-Allergic

  • Cold air or temperature changes
  • Spicy foods (gustatory rhinitis)
  • Medications (nasal spray overuse, ACE inhibitors)
  • Pregnancy rhinitis

Structural

  • Nasal polyps
  • Deviated septum
  • Turbinate hypertrophy

When to see a doctor

  • 1Thick, discolored (green or yellow) discharge lasting more than 10 days without improvement
  • 2Runny nose with high fever, severe headache, or facial pain (bacterial sinusitis)
  • 3One-sided clear discharge after a head injury — may be CSF leak
  • 4Runny nose in an infant that interferes with feeding or breathing
  • 5Chronic symptoms not responding to OTC antihistamines or decongestants

What you can do

  • ✓Saline nasal irrigation (neti pot or saline spray) — flushes allergens and mucus
  • ✓Stay well hydrated — thins mucus secretions
  • ✓Use a humidifier to keep nasal passages moist in dry climates
  • ✓Avoid known allergen triggers — shower after outdoor exposure during pollen season
  • ✓Honey and warm liquids may soothe irritated mucous membranes

Conditions that cause this symptom

Allergic RhinitisJ30.9Common ColdJ00SinusitisJ32.9

Medications that may help

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

Loratadine

Non-drowsy antihistamine for allergic rhinorrhea

Fluticasone nasal spray

Intranasal corticosteroid — first-line for allergic rhinitis

Pseudoephedrine

Decongestant for congestion and rhinorrhea

Frequently asked questions

This page is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified health provider with questions about your symptoms or medical conditions.

Have a question about runny nose?

Ask MedMind AI about causes, medications, or next steps.

Ask MedMind AI