Blocked nose vs runny nose: how the symptoms differ

A blocked nose is difficulty moving air through the nostrils, while a runny nose is fluid or mucus coming out of the nostrils.

Both symptoms can develop with a cold, allergy, smoke exposure, temperature changes, or nasal irritation. Swollen nasal lining tends to create the blocked feeling, while increased mucus production creates a runny nose. You can have either one alone or both at once, and the balance can shift during the same illness. The colour of mucus by itself does not reliably tell you whether you need an antibiotic.

Use blocked nose when it feels difficult to draw air through your nostrils, even if little mucus is coming out. The sensation can be worse when you lie down or in dry, dusty, or smoky environments. Saline spray or rinse may loosen mucus and moisturise the nose. Use clean water as directed for nasal rinsing, and check with a pharmacist or clinician before using decongestant products if you have a medical condition, are pregnant, or take regular medication.

Use runny nose when fluid or mucus repeatedly comes from the nostrils or drains into the throat. Clear watery discharge with sneezing or itchy eyes can fit an allergic pattern, while a runny nose with sore throat, cough, or tiredness can occur during a viral illness. Gentle tissues, skin protection around the nostrils, fluids, and avoiding known irritants can ease discomfort while the cause settles.

Seek urgent help for trouble breathing, swelling of the lips, tongue, or face, severe eye pain or swelling, confusion, a stiff neck, or severe headache with a high fever. Arrange medical advice for a persistent one-sided blockage, repeated nosebleeds, foul-smelling one-sided discharge, facial swelling, or symptoms that keep returning. Babies and people with breathing conditions may need earlier assessment when nasal symptoms interfere with feeding, sleep, or breathing.

Postnasal drip describes mucus felt running down the back of the throat, often causing throat clearing or cough. Sneezing is a separate reflex and may be the most bothersome feature of allergy. A reduced sense of smell, facial pain, or ear pressure can accompany nasal symptoms but should be described separately, because each gives the clinician a different clue about what is happening.

A clinician will ask about the timing of symptoms, allergy triggers, recent respiratory illness, work or home exposures, medicines, previous nasal injury, and whether one side is affected. They may examine the nostrils, throat, ears, eyes, and face. Recommendations can then be tailored to likely irritation, allergy, infection, structural narrowing, or another cause, rather than relying on mucus appearance alone.