KIDSGreen snot means a child needs antibiotics
Is this true? Make your call, then see what the science says.
Short answer: No. The evidence doesn’t support this.
Green or yellow snot alone does not mean a child needs antibiotics. Most colds and sinus infections are viral. Doctors look at how long symptoms last, whether they worsen, and how high the fever is.
AI-generated summary of the research cited · not reviewed by a medical professional · checked 14 October 2026 · How we checkWhat the research found
Paediatric guidance says mucus that is yellow or green does not necessarily mean a bacterial infection. Most sinus infections are caused by viruses and usually clear up on their own. Antibiotics do not help with viruses.
A 2013 clinical practice guideline defines bacterial sinusitis by pattern, not by snot colour. It looks for nasal discharge of any quality lasting more than 10 days, a worsening course after initial improvement, or severe onset with high fever and pus-like discharge for at least 3 days.
A 2023 randomised trial of 515 children aged 2 to 11 tested antibiotics against placebo. It was designed partly to see whether coloured nasal discharge identified children who would benefit. A 2025 review says antibiotics should be considered for severe symptoms, clear worsening, or 7 or more days of symptoms.
What it doesn’t mean
- Some children with sinusitis do need antibiotics. The signs are a cold that lingers more than 10 days, gets worse after improving, or comes with a high fever and thick discharge for several days. A doctor should make that call.
- Antibiotics have side effects, including diarrhoea, vomiting, rash and allergic reactions. Overuse also feeds antibiotic resistance.
- See a GP if your child's illness gets worse after improving, or if they have a high fever, or if symptoms drag on.
Sources
General information only, not medical advice. KIDS fact-checks are generated by AI from published research and are not reviewed by doctors or other health professionals. They can be wrong or out of date. Always talk to your GP or child’s doctor about your child, and call 000 in an emergency. Spotted a problem? Tell us.
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