Allergies vs Cold: How to Tell the Difference and Treat Each in Australia
At a Glance
The fastest way to tell the difference: allergies cause itchy eyes and nose, produce clear watery mucus, and never cause a fever. Colds bring thicker coloured mucus, body aches, and sometimes a mild fever. Allergies last as long as you are exposed to the trigger; colds resolve in 7 to 10 days.
Why It Matters
Millions of Australians reach for cold and flu tablets when they actually have hayfever, or take antihistamines when they have a cold. Getting the diagnosis wrong means your treatment will not work well — and you could be spending money on the wrong products. The symptoms overlap enough to confuse anyone, but there are several reliable ways to tell the two apart.
Allergies vs Cold: Symptom Comparison
The table below compares the most common symptoms of allergic rhinitis (hayfever) and the common cold side by side. Use it as a quick reference when you are unsure which one you are dealing with.
| Symptom | Common Cold | Allergies (Hayfever) |
|---|---|---|
| Duration | 7-10 days | Weeks to months (while exposed to allergen) |
| Onset | Gradual — builds over 1-3 days | Rapid — within minutes of exposure |
| Fever | Sometimes (low-grade) | Never |
| Body aches | Common (mild to moderate) | Rare |
| Itchy eyes | Rare | Very common — hallmark symptom |
| Itchy nose or throat | Uncommon | Very common |
| Sneezing pattern | Occasional sneezes | Repeated bursts of sneezing |
| Nasal discharge | Starts clear, turns thick yellow or green | Clear and watery throughout |
| Sore throat | Common — often the first symptom | Uncommon (occasional post-nasal drip irritation) |
| Cough | Common (mild to moderate) | Occasional (from post-nasal drip) |
| Seasonality | More common in winter | Peaks in spring and early summer (varies by region) |
| Contagious | Yes — spread by droplets and contact | No — allergies are not contagious |
The 'Itch Test'
Ask yourself: is anything itchy? If your eyes, nose, or the roof of your mouth itch, it is almost certainly allergies. Colds cause discomfort and irritation, but not that distinctive itch.
How to Tell the Difference Quickly
When symptoms first appear, run through these five quick checks. You do not need all five to point the same way — even two or three matching answers will give you a reliable guide.
- •Check the calendar. Spring or early summer in your area? Hayfever is far more likely.
- •Check your eyes. Itchy, red, or watery eyes strongly suggest allergies. Colds rarely affect the eyes.
- •Check your mucus. Clear and runny for the duration points to allergies. Mucus that starts clear then turns thick, yellow, or green suggests a cold.
- •Check for body aches or fever. Even a mild temperature or 'run down' feeling favours a cold. Allergies do not cause these.
- •Check the timing. Symptoms that flare up outdoors, on windy days, or after mowing the lawn, and then improve indoors, are classic for allergies.
When to See a Doctor
See your GP if you develop a high fever (above 38 degrees C), breathing difficulty, chest pain, symptoms lasting more than 10 days without any improvement, or severe facial pain and thick green discharge (which may indicate a sinus infection). Also see your GP if OTC allergy treatments are not controlling your symptoms after two weeks.
Treatment for Allergies (Hayfever)
Allergic rhinitis is best treated with a combination approach: an antihistamine tablet for all-over symptom relief plus a corticosteroid nasal spray for nasal congestion and inflammation. Both are available without a prescription in Australia.
Antihistamine tablets
Modern second-generation antihistamines provide 24-hour relief without significant drowsiness. The three main active ingredients available OTC in Australia are cetirizine, loratadine, and fexofenadine. All are effective, but they suit different people.
| Active Ingredient | Brand Example | Onset | Duration | Drowsiness Risk | Best For |
|---|---|---|---|---|---|
| Cetirizine 10mg | Zyrtec | 30-60 min | 24 hours | Low (slightly higher than others) | Strongest itch relief; hives |
| Loratadine 10mg | Claratyne | 1-3 hours | 24 hours | Very low | People who are sensitive to drowsiness |
| Fexofenadine 180mg | Telfast | 30-60 min | 24 hours | Very low | Fast relief without any sedation risk |
All three antihistamines work well for most people. If one does not control your symptoms after a week, try switching to a different one — individual responses vary. Pharmacy-own brands containing the same active ingredient are equally effective and often significantly cheaper.
Zyrtec Rapid Acting Antihistamine
Fast-acting antihistamine for relief from hayfever, hives, and other allergic conditions.
Claratyne Hayfever & Allergy Relief
Non-drowsy antihistamine for 24-hour relief from hayfever and allergy symptoms.
Telfast 180mg Antihistamine
Non-drowsy, fast-acting antihistamine for relief of hayfever and allergic rhinitis.
Corticosteroid nasal sprays
Nasal corticosteroid sprays are the most effective single treatment for moderate to severe hayfever. They reduce inflammation, congestion, sneezing, and nasal itch. For best results, start using them a week or two before your usual allergy season begins and use them daily — they work best with consistent use rather than on an as-needed basis.
| Active Ingredient | Brand Example | Doses Per Day | Key Notes |
|---|---|---|---|
| Mometasone furoate | Nasonex | Once daily | Widely available OTC since 2014; low systemic absorption |
| Fluticasone propionate | Flixonase | Once or twice daily | Available OTC; well established track record |
| Budesonide | Rhinocort | Once or twice daily | Available OTC; suitable for adults and children 6+ |
| Beclomethasone | Beconase | Twice daily | One of the original OTC options; effective and affordable |
Correct Technique Matters
Point the spray nozzle slightly away from the centre of your nose (towards the same-side ear). Breathe in gently — do not sniff hard. This directs the spray onto the nasal lining where it works, rather than straight down your throat.
Nasonex Allergy Nasal Spray
Once-daily nasal spray for prevention and treatment of nasal allergy symptoms.
Flixonase Allergy & Hayfever 24 Hour Nasal Spray
Once-daily corticosteroid nasal spray with fluticasone for 24-hour relief from hayfever and allergy nasal symptoms.
Beconase Hayfever Nasal Spray
Corticosteroid nasal spray for effective prevention and treatment of hayfever symptoms.
Eye drops and other options
If itchy or watery eyes are your main complaint, add antihistamine eye drops such as Zaditen (ketotifen) or Livostin (levocabastine), available from pharmacies. For mild nasal congestion, a non-medicated saline spray such as Fess can help wash allergens out of the nose and is safe to use as often as needed, including alongside medicated sprays.
Fess Saline Nasal Spray
Non-medicated saline nasal spray to help relieve nasal and sinus congestion. Drug-free and suitable for daily use.
Treatment for Colds
There is no cure for the common cold. Treatment focuses on relieving the symptoms that bother you most while your immune system clears the virus, which typically takes 7 to 10 days.
Pain and fever relief
Paracetamol (such as Panadol) is the go-to choice for sore throat, headache, and mild fever. Take 500mg to 1000mg every four to six hours, up to a maximum of 4000mg per day. Ibuprofen is an alternative if you also have sinus pain or inflammation, but take it with food.
Panadol Rapid (Paracetamol 500mg)
Fast-acting pain relief. Gentle on the stomach. Suitable for headaches, fever, and general aches.
Nasal decongestants
Pseudoephedrine-based products such as Sudafed are the most effective OTC decongestants for cold-related nasal congestion. In Australia, these are kept behind the pharmacy counter — you will need to show ID and sign a register. Products containing oral phenylephrine (found on open shelves) have been shown in recent studies to be no more effective than placebo.
Sudafed Nasal Decongestant
Effective relief from nasal and sinus congestion caused by cold, flu, or allergies.
Combination cold and flu products
If you have multiple cold symptoms — congestion, headache, mild fever, and runny nose — a combination product like Codral Cold and Flu or Demazin can be convenient. Be careful not to take additional paracetamol on top, as many combination products already contain it.
Codral Cold & Flu Day & Night
Day and night formula for relief from cold and flu symptoms including blocked nose, headache, and fever.
Do Not Use Antibiotics
Colds are caused by viruses. Antibiotics only work against bacteria and will not help a cold. Taking antibiotics unnecessarily contributes to antibiotic resistance, which is a serious public health concern in Australia.
Rest and home care
- •Drink plenty of fluids — water, herbal teas, clear broths. There is no strong evidence that specific amounts help, but staying hydrated keeps mucus thinner.
- •Rest as much as possible. Your body fights the virus more effectively when you are not pushing through.
- •Use a saline nasal rinse or spray to help clear congestion without medication.
- •Honey (one to two teaspoons) may help soothe a sore throat and cough in adults and children over 12 months. Evidence is modest but it is safe and inexpensive.
- •Gargle with warm salt water for sore throat relief.
What If It Is Both? Allergies and a Cold at the Same Time
Yes, you can absolutely have both at once — and it is not uncommon. People with allergic rhinitis tend to have more inflamed nasal passages, which may make them slightly more susceptible to catching colds. When both conditions overlap, symptoms tend to be worse and last longer than either would alone.
If you suspect you have both, you may need to treat each condition separately. Continue your antihistamine and nasal spray for the allergy component, and add paracetamol or a decongestant for the cold symptoms. Avoid older 'first-generation' antihistamines like promethazine (Phenergan) for this purpose, as they cause significant drowsiness and can thicken mucus, making cold symptoms worse.
Clue for Overlap
If your usual allergy medications are helping your itchy eyes and sneezing but not your sore throat, body aches, or coloured mucus, a cold may be riding on top of your hayfever.
Australian Hayfever Seasons by Region
Unlike many Northern Hemisphere countries where hayfever has one clear season, Australia's varied climate means pollen seasons differ significantly by region. Grass pollen is the most common hayfever trigger in Australia, but tree and weed pollens also play a role depending on where you live.
| Region | Peak Hayfever Season | Main Pollen Triggers | Notes |
|---|---|---|---|
| South-East Australia (VIC, ACT, southern NSW) | October to December | Ryegrass, timothy grass, birch, cypress | Highest pollen counts in the country; thunderstorm asthma risk in November |
| Sydney and Central NSW | September to November | Ryegrass, bermuda grass, plane trees | Moderate pollen levels; worsened by windy days |
| Queensland (SEQ and North) | August to November (longer in tropics) | Bahia grass, bermuda grass, wattle | Tropical regions can have year-round symptoms due to mould and dust mites |
| South Australia | October to December | Ryegrass, olive trees, paterson's curse | Dry winds can carry pollen from rural areas into Adelaide |
| Western Australia (Perth) | September to November | Ryegrass, bermuda grass, sheoak | Generally shorter but intense pollen season |
| Tasmania | November to January | Ryegrass, plantain, birch | Later season due to cooler climate; lower overall pollen counts |
| Northern Territory | Year-round (peaks vary) | Grass pollens, dust mites, mould | Humidity and mould spores are a bigger trigger than pollen in many areas |
Thunderstorm Asthma
South-east Australia, particularly Melbourne and surrounding areas, faces a unique risk of epidemic thunderstorm asthma events, usually in October or November. During these events, storms break pollen grains into tiny particles that penetrate deep into the lungs. If you have hayfever, carry your reliever inhaler during storm season and monitor the Melbourne Pollen Count and Thunderstorm Asthma Forecast provided by the Victorian Department of Health.
Prevention Tips
Reducing allergy exposure
- •Check daily pollen forecasts on the AusPollen website or via weather apps.
- •Keep windows closed on high pollen days, especially in the morning when counts peak.
- •Shower and change clothes after spending time outdoors during pollen season.
- •Wear wrap-around sunglasses outside to protect your eyes.
- •Dry laundry indoors or in a dryer during peak pollen season — sheets hung outside collect pollen.
- •Start your corticosteroid nasal spray one to two weeks before your local pollen season begins for best results.
Reducing cold risk
- •Wash hands frequently with soap and water, especially after public transport or shared spaces.
- •Avoid touching your face, particularly your eyes, nose, and mouth.
- •Stay home when you are unwell to avoid spreading the virus to others.
- •Clean commonly touched surfaces like door handles, phones, and keyboards.
- •Maintain good general health — regular sleep, balanced diet, and moderate exercise all support immune function.
Frequently Asked Questions
How do I know if it is hayfever or a cold?
The most reliable indicators are itch and duration. Allergies cause itchy eyes, nose, or throat and last for weeks or months. Colds cause body aches and sometimes fever, and clear up within 7 to 10 days. If your symptoms disappear when you go indoors or on a rainy day, that strongly suggests allergies.
Can I take antihistamines for a cold?
Older, sedating antihistamines (first-generation, like chlorphenamine found in some cold and flu tablets) may help dry up a runny nose during a cold due to their anticholinergic effects. However, modern non-drowsy antihistamines like cetirizine, loratadine, and fexofenadine have minimal benefit for cold symptoms. If you have a cold, you are better off with paracetamol and a decongestant.
Why are my allergies worse some years than others?
Pollen seasons vary in intensity from year to year depending on rainfall, temperature, and wind patterns. A wet winter followed by a warm spring tends to produce a worse hayfever season because grasses grow more vigorously. Climate change is also extending pollen seasons and increasing pollen counts in many parts of Australia.
Are pharmacy-own brand antihistamines as good as branded ones?
Yes. All antihistamines sold in Australia must meet the same TGA standards for quality, safety, and efficacy, regardless of the brand name on the box. A 10mg cetirizine tablet from Chemist Warehouse's own brand works the same as a 10mg Zyrtec tablet. The active ingredient and dose are identical — only the price differs.
Can children get hayfever? When should I see a doctor?
Yes, hayfever commonly develops in childhood, often from around age five. Some antihistamines and nasal sprays are approved for children (check age on the label), but always consult your pharmacist or GP before giving allergy medication to children under six. See your GP if your child's symptoms are affecting their sleep, concentration at school, or quality of life, or if you suspect asthma may also be present.
Should I get an allergy test?
If your symptoms are mild and respond well to OTC treatment, formal allergy testing is usually unnecessary. Consider seeing your GP for a referral to an allergist if your symptoms are severe, not responding to treatment, occurring year-round, or if you want to explore immunotherapy (desensitisation). Skin prick tests and specific IgE blood tests can identify your exact triggers, which can help with avoidance strategies.
Disclaimer
This article is for informational purposes only and does not constitute medical advice. Always read the label and follow the directions for use. If symptoms persist, talk to your health professional. See your pharmacist or GP for advice tailored to your situation.
Our Recommendation
If your nose is itchy, your eyes are watery, and your symptoms flare every time you step outside on a windy spring day, you are almost certainly dealing with allergies. Treat with a non-drowsy antihistamine and a corticosteroid nasal spray. If your symptoms came on gradually with a sore throat, coloured mucus, and mild body aches, it is most likely a cold. Treat with paracetamol, a decongestant if needed, and plenty of rest. See your GP if symptoms persist beyond 10 days or you develop a fever above 38 degrees C.
