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Excess mucus from the nose. Usually from colds, allergies, or irritants.
There are several possible causes. Here are the most common ones:
Viral infection.
You might suspect this if you have:
Allergic reaction to pollen.
You might suspect this if you have:
Influenza virus.
You might suspect this if you have:
Sinus infection.
You might suspect this if you have:
Important: This information is for general guidance only and should not be used to self-diagnose. A doctor can properly assess your symptoms and provide appropriate advice.
Call 000 or go to Emergency immediately
A runny nose on its own is rarely serious and usually indicates a viral cold or allergic rhinitis. The clinical question is whether it is infectious (clear initially, then thickening over days, with other cold symptoms) or allergic (clear, watery, with sneezing and itchy eyes, often seasonal). Green or yellow mucus does NOT automatically mean bacterial infection — it simply means the immune system is active. Bacterial sinusitis is considered if nasal symptoms persist beyond 10 days without improvement or if there is a 'double worsening' pattern.
Medical certificate guidance: A runny nose alone is unlikely to warrant a certificate unless combined with other symptoms (fever, body aches, fatigue) that prevent work. As part of a cold or flu, 2-3 days is typical.
All clinical decisions are made by AHPRA-registered doctors following our clinical governance framework. We never automate clinical decisions.
If combined with other cold/flu symptoms that prevent you from working, yes.
Most runny noses are viral. Antibiotics are only for bacterial sinusitis, which a doctor can assess.
If your symptoms are keeping you from work or study, you can request a medical certificate through InstantMed. A doctor will review your symptoms and issue a certificate if clinically appropriate — typically for 1 to 3 days depending on severity. You don't need to be dramatically unwell; feeling genuinely too rough to function is reason enough.
Yes. Australian-registered doctors can assess your symptoms and issue valid medical certificates via telehealth. You fill in a detailed health questionnaire, a doctor reviews it, and if appropriate, your certificate is delivered digitally. No waiting room required.
You complete a structured health questionnaire covering your symptoms, duration, severity, and relevant medical history. The reviewing doctor uses this information — the same clinical reasoning they'd apply in a face-to-face consult — to determine whether a certificate, advice, or referral is appropriate.
A medical certificate covers the period stated on the document. If your symptoms worsen or don't improve as expected, you should see a GP in person or visit your nearest emergency department if it's urgent. Your certificate doesn't replace ongoing care — it's a point-in-time clinical assessment.
In some cases, yes. If a doctor reviewing your request determines that a common, non-restricted treatment is appropriate, they may issue a prescription as part of a consultation. Not all symptoms require or qualify for a prescription — the doctor will advise you on next steps.
Medical certificates are typically issued in under 30 minutes, available 24/7. Other requests are reviewed within 1–2 hours during operating hours (8am–10pm AEST, 7 days). You'll receive an email notification once your request has been reviewed.
If your symptoms suggest something that requires a physical examination, diagnostic tests, or specialist referral, the doctor will let you know and recommend appropriate next steps. Your safety is the priority — telehealth is a great option for many things, but it's not a replacement for hands-on assessment when that's what's needed.
No Medicare card is required for medical certificates. If you're requesting a prescription or consultation, a valid Medicare card is needed. Our service is private and does not attract a Medicare rebate, though any prescriptions issued can still attract PBS subsidies at the pharmacy.
Pain, scratchiness, or irritation in the throat that often worsens when swallowing. One of the most common reasons people seek medical advice.
A reflex that helps clear your airways. Can be dry or productive (with mucus), and acute (short-term) or chronic (lasting weeks).
A body temperature above 38°C (100.4°F). Usually a sign your body is fighting an infection. Common and usually not serious in adults.
Our Australian-registered doctors can assess your symptoms and provide advice, treatment, or medical certificates if needed.
Get assessedThis information is for general educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making decisions about your health. Content on this page has been reviewed by AHPRA-registered Australian doctors but does not replace a personalised medical consultation.