Since colds and allergies share many of the same symptoms, it can be hard to tell if you’re coming down with something or suffering from allergies. Here are ways to help you learn some of the differences between allergies and a cold, so you can find the right relief for your symptoms.
What Are Allergies?
If you have allergies, your immune system mistakes a substance that is harmless to most people as a threat and goes into defense mode. These substances, that can come from sources like pollen, pet dander, mould and dust mites, are called allergens.1
What is a Cold?
A cold happens when a virus makes its way into your body. Your immune system responds to this foreign invader by attacking the virus. Some of the cold symptoms, like runny nose and nasal congestion, can feel a lot like allergies so it can be hard to tell the difference. A cold is contagious. You can catch it notably when someone with a cold sneezes, coughs or touches you.2,3
Learn Some of the Differences Between Allergies and a Cold
While colds and allergies can have similar symptoms, here are some questions to help you tell if you should consider reaching for some Claritin® or curl up with a bowl of chicken noodle soup and binge watch your favourite shows:
How quickly did your symptoms strike?
Allergy symptoms tend to hit all at once when you come into contact with an allergen. Symptoms of a cold usually appear one at a time and develop slowly over a few days.4
How long have you had symptoms?
Colds typically run their course within 7-10 days. Allergy symptoms can last weeks or months, and will be present as long as you are exposed to the allergen. If your cold symptoms last longer than 10 days, talk to your doctor.5
What colour and texture is your mucus?
Runny nose and sneezing are common symptoms of both colds and allergies. But you can often tell the difference by looking at the colour and texture of your mucus. If you have allergies, your mucus will typically be clear, thin and watery. If you have a cold, the mucus from coughing or sneezing may be thick and yellow or green. Yellow or green mucus could indicate an infection requiring medical attention.6
Do you have body aches and pains?
Colds may come with slight body aches and pains. Allergies are not usually associated with body aches and pains.5
What time of year is it?
Colds are more common during the winter months, but could also occur any time of the year. Indoor (perennial) allergies can happen year-round and outdoor seasonal allergies are more common in the spring through fall when pollen counts are high.4
References
- Mayo Clinic. Allergies. 2024.
- American Family Physician. Treatment of the Common Cold in Children and Adults.
- Mayo Clinic. Cold or allergy: Which is it? 2024.
- VeryWellHealth. Cold vs. Allergies: Similar but Fundamentally Different Symptoms. 2026.
- GoodRX. Allergies vs. Cold: What’s Causing Your Symptoms? 2025.
- Health.com. 7 Differences Between Allergies and a Cold. 2025.
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