Runny Nose

A runny nose, or rhinorrhea, is extra mucus dripping from your nose. It may signal your body responding to irritants, infections, or allergies.

Medical illustration about Runny Nose

Possible Causes

Runny Nose in Adults

  • Allergies (allergic rhinitis) — Exposure to pollen, dust, or pet dander may trigger histamine release, leading to watery mucus in adults.
  • Viral infections — Colds or flu viruses might irritate nasal linings, causing clear then thicker mucus as the body fights back.
  • Nonallergic rhinitis — Irritants like smoke or strong smells could cause ongoing symptoms without an allergy.
  • Sinus infections (sinusitis) — Blocked sinuses from bacteria or viruses may lead to thick, colored mucus.
  • Gustatory rhinitis — Spicy or hot foods might stimulate nerves, resulting in a sudden runny nose.

Runny Nose in Children

  • Viral infections — Colds or RSV are common in kids due to close contact at school or daycare, irritating nasal passages.
  • Allergies — Pollen or dust might cause itchy, watery noses, similar to adults but often harder to pinpoint.
  • Foreign objects — Kids may insert toys or food into one nostril, prompting foul-smelling mucus from that side.
  • Adenoid issues — Enlarged adenoids (tissue behind the nose) could block drainage and increase mucus.

Runny Nose in Elderly

  • Chronic allergies — Long-term exposure to allergens may worsen with age-related immune changes.
  • Infections — Weaker immunity might make colds or flu cause prolonged or severe runny noses.
  • Medication side effects — Blood pressure drugs or others could dry nasal passages or increase mucus as a side effect.
  • Nasal polyps — Benign growths from chronic inflammation may lead to ongoing drip.
  • Dry air sensitivity — Thinner nasal linings in older adults might overproduce mucus in cold, dry conditions.

Runny Nose in Pregnant Women

  • Pregnancy rhinitis — Hormone shifts and increased blood flow may swell nasal tissues for weeks or months.
  • Allergies — Immune changes during pregnancy could heighten reactions to pollen or dust.
  • Viral infections — Colds remain common and might feel worse due to fatigue or nasal swelling.
  • Acid reflux (GERD) — Stomach acid rising up may irritate the throat and nose indirectly.

When to See a Doctor

Talk to your doctor if a runny nose lasts more than 10 to 14 days, especially with fever or facial pain. Research suggests this might signal a sinus infection or other issue needing care (Cleveland Clinic).

Seek help right away for clear, watery discharge from one nostril, particularly after a head injury—this could be a cerebrospinal fluid (CSF) leak, a rare but serious problem (UVA Health). Foul-smelling, bloody, or one-sided mucus also warrants a check.

Consult a healthcare professional if you have trouble breathing, swelling around eyes or cheeks, blurred vision, or severe headaches. These red flags may point to complications like infections or polyps.

Home Remedies

Drink plenty of fluids like water to thin mucus and stay hydrated. A humidifier or steamy shower might ease dryness and congestion (Mayo Clinic).

Try saline nasal sprays to gently clear passages—use as directed. Rest and avoid irritants like smoke can help symptoms improve.

These steps may offer relief, but they are not a cure. Always consult your doctor if symptoms persist beyond a week or worsen, especially in children, elderly, or pregnant women.

Frequently Asked Questions

How long might a runny nose last?

For colds, it often clears in 7 to 10 days, but allergies may continue with exposure. Chronic cases lasting over three weeks need a doctor's input (Cleveland Clinic).

Can a runny nose mean COVID-19?

It might be a symptom, along with fever or loss of taste/smell. Testing is key if you suspect it (CDC).

Does mucus color matter?

Clear is common for allergies or early colds; yellow or green might suggest infection, but not always. Talk to your doctor for thick, colored discharge.

Does teething cause runny noses in babies?

Teething does not typically cause it—excess drool might mimic, but a virus or allergy is more likely. Consult a pediatrician (Cleveland Clinic).

How can I prevent a runny nose?

Wash hands often, avoid allergens, and stay indoors on high-pollen days. Vaccines and healthy habits support immunity (CDC).

Sources

  1. Rhinorrhea (Runny Nose) Causes, Treatment & Prevention. Cleveland Clinic
  2. Runny nose. Mayo Clinic
  3. Common Cold. CDC
  4. Nasal Congestion and Rhinorrhea. Merck Manuals