Seasonal Allergies vs. a Cold: How to Tell the Difference

Spring is beautiful — until it isn't. One day you're enjoying the flowers and mild weather, the next you're sneezing uncontrollably with a runny nose. But is it allergies? Or is a cold sneaking up on you? The confusion is understandable: both start with similar symptoms. But the cause is completely different, and so is the best way to treat it.

The Core Difference: What's Actually Causing It

Here's the fundamental distinction: a cold is caused by a virus (often rhinovirus), while seasonal allergies are caused by your immune system reacting to pollen, dust, or other allergens. This difference determines everything else about how the condition develops and how you should treat it.

With a cold, your body is fighting off an infection. With allergies, your immune system is overreacting to something harmless. Neither will respond to antibiotics (unless a bacterial infection develops later), but the right over-the-counter treatments differ significantly.

Key Symptoms Compared

Seasonal Allergies

• Itchy eyes and nose — this is a classic allergy sign. The itching can be intense.
• Sneezing fits — often multiple sneezes in a row.
• Clear, watery nasal discharge — the mucus is typically thin and clear, never thick or colored.
• No fever — allergies never cause a fever.
• Lasts weeks or months — especially if you're exposed to the trigger (pollen season, dust in your home).
• May have itchy throat — a tickly, scratchy feeling is common.

Common Cold

• Sore throat — often the first sign, starts scratchy and may worsen.
• Body aches — muscles and joints may feel achy and fatigued.
• Low-grade fever — common early on, typically 37.5–38.5°C (99.5–101.3°F).
• Thick or colored mucus — often starts clear but becomes white, yellow, or greenish after a few days.
• Lasts 7–10 days — colds have a predictable timeline and generally improve without treatment.
• Cough — may develop later in the cold.

The Timing Test: Does It Ever Get Better?

This is one of the most practical ways to tell them apart. A cold follows a timeline: it starts, peaks around day 3–5, and gradually improves over 7–10 days. You feel progressively better, even if slowly.

Seasonal allergies, on the other hand, persist as long as you're exposed to the trigger. If you're miserable for weeks every spring, that's allergies. If your symptoms appeared suddenly, peaked, and are now fading, it's probably a cold.

Fever: The Clearest Differentiator

If you have a fever, you almost certainly have a cold (or another infection), not allergies. Allergies do not cause fever. If your temperature is elevated, your immune system is fighting a virus or bacterial infection, not reacting to pollen.

A low-grade fever in the 37.5–38°C range is very common with colds. Higher fevers (above 38.5°C) warrant a call to your doctor.

Over-the-Counter Options for Allergies

If you've determined it's allergies, here are the treatments our pharmacists most often recommend:

Antihistamines

These block the release of histamine, the chemical your body releases during an allergic reaction. For seasonal allergies, we typically recommend the newer, non-drowsy options:

• Cetirizine (Reactine) — works well for most people; rarely causes drowsiness.
• Loratadine (Claritin) — similar to cetirizine; gentle, long-acting.
• Fexofenadine (Allegra) — another non-drowsy option; good for people sensitive to other antihistamines.

Take these daily during allergy season, not just when symptoms flare. They work better as prevention than as rescue medication.

Nasal Corticosteroid Sprays

Products like Flonase (fluticasone) and Nasacort (triamcinolone) are often the most effective for persistent symptoms. They reduce inflammation in your nasal passages. Again, use them daily — they're most effective when used consistently.

Decongestants

Pseudoephedrine (Sudafed) can temporarily clear a congested nose. However, use for no more than 3 days — longer use can lead to rebound congestion where your nose gets even more stuffy when you stop.

Antihistamine Eye Drops

If itchy eyes are your main complaint, specialized eye drops work better than oral medication. Products like ketotifen eye drops provide quick relief.

Over-the-Counter Options for Colds

For a cold, there's no magic cure — antibiotics don't work — but you can manage symptoms while your immune system does its job:

• Rest and hydration — the most important treatments. Drink water, tea, broth, anything warm and soothing.
• Acetaminophen or ibuprofen — for aches, fever, and general discomfort. Follow package directions.
• Honey and lemon — a warm drink with honey soothes a sore throat naturally.
• Saline nasal drops or spray — helps clear congestion without medication.
• Vitamin C — while it won't prevent a cold, it may shorten its duration slightly if taken early.

When to See Your Doctor

Most colds resolve on their own. But see your doctor if:

• Your symptoms haven't improved after 10 days (or have gotten worse).
• Your fever is above 38.5°C or lasts more than 3 days.
• You develop ear pain, sinus pressure that doesn't improve with decongestants, or green nasal discharge lasting more than a week.
• You have significant shortness of breath, chest pain, or confusion.
• You're elderly, pregnant, or have a weakened immune system — these groups can develop complications more easily.

For allergies, see a doctor if over-the-counter treatments aren't helping. They may recommend prescription-strength options or allergy testing to identify your specific triggers.

What We Stock at Keating's

We carry a full range of allergy and cold remedies from trusted brands. If you're unsure which product is right for you, our pharmacists can help. We can recommend the best option based on your specific symptoms and any other medications you take — because interactions matter.

And remember: if your symptoms suggest a cold that might be getting worse, or if you're pregnant, elderly, or immunocompromised, don't hesitate to ask about when you should call your doctor.