Cold vs Allergies: Key Differences

Content reviewed against published AAP, ACAAI, Mayo Clinic guidelines

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Colds and allergies can look very similar in children — both cause runny noses, sneezing, and congestion. Knowing the difference helps avoid unnecessary treatment and identify when allergy management is needed.

Key takeaways

  • Allergies never cause fever; colds sometimes do
  • Allergies cause significant itching (nose, eyes, throat); colds rarely itch
  • Cold symptoms resolve in 7-10 days; allergy symptoms persist as long as exposure continues
  • Allergy nasal discharge stays clear; cold discharge often turns colored

: Cause

Common Cold: Viral infection (200+ viruses, rhinovirus most common)

Allergies (Allergic Rhinitis): Immune reaction to allergens (pollen, dust mites, pet dander)

: Onset

Common Cold: Gradual over 1-2 days

Allergies (Allergic Rhinitis): Sudden when exposed to allergen

: Duration

Common Cold: 7-10 days

Allergies (Allergic Rhinitis): Weeks to months (as long as exposure continues)

: Nasal discharge

Common Cold: Starts clear, may turn yellow/green

Allergies (Allergic Rhinitis): Always clear and watery

: Itching

Common Cold: Uncommon

Allergies (Allergic Rhinitis): Very common — itchy nose, eyes, throat, roof of mouth

: Fever

Common Cold: Low-grade fever possible

Allergies (Allergic Rhinitis): Never causes fever

: Eyes

Common Cold: May be watery

Allergies (Allergic Rhinitis): Red, itchy, watery (allergic conjunctivitis) very common

: Sneezing pattern

Common Cold: Occasional

Allergies (Allergic Rhinitis): Frequent, often in rapid bursts

: Time pattern

Common Cold: Any time of year, resolves in 7-10 days

Allergies (Allergic Rhinitis): Seasonal pattern or triggered by specific environments

: Contagious

Common Cold: Yes — spreads through contact and droplets

Allergies (Allergic Rhinitis): No — not contagious

When to Worry

  • Symptoms lasting more than 10-14 days without improvement (may be sinusitis or allergies, not just a cold)
  • Wheezing or difficulty breathing (allergies can trigger asthma)
  • Persistent ear pain or hearing difficulty
  • Allergies significantly affecting sleep, feeding, or daily activities
  • Facial swelling or difficulty breathing after exposure (possible anaphylaxis — call 911)
Learn more about Common Cold

Frequently asked questions

What is the main difference between Common Cold and Allergies (Allergic Rhinitis)?
Allergies never cause fever; colds sometimes do
How can I tell if my baby has Common Cold or Allergies (Allergic Rhinitis)?
Allergies never cause fever; colds sometimes do. Allergies cause significant itching (nose, eyes, throat); colds rarely itch. Cold symptoms resolve in 7-10 days; allergy symptoms persist as long as exposure continues
When should I worry?
Symptoms lasting more than 10-14 days without improvement (may be sinusitis or allergies, not just a cold). Wheezing or difficulty breathing (allergies can trigger asthma). Persistent ear pain or hearing difficulty. Allergies significantly affecting sleep, feeding, or daily activities. Facial swelling or difficulty breathing after exposure (possible anaphylaxis — call 911)

Sources

AAPACAAIMAYO CLINIC

All content follows our editorial policy and is reviewed against published clinical guidelines.

2,705 evidence-based guides6 authoritative medical sources

Bottom line

Both Common Cold and Allergies (Allergic Rhinitis) are common in young children. The key differences in symptoms can help you identify what your child may have, but when in doubt, consult your pediatrician.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.