Quick read
Key points
- 1
A cough is the body's natural reflex for clearing the airways of mucus, irritants, or foreign particles, and is most commonly caused by a cold, flu, or other minor respiratory infection. Coughs can be dry or produce mucus, and most clear up within a few weeks as the underlying cause resolves.
- 2
Use duration, severity and associated symptoms to distinguish self-limiting cough from pneumonia, asthma, sepsis, PE and other serious causes.
- 3
A cough lasts longer than three weeks
01 · Know
What is Cough?
A cough is the body's natural reflex for clearing the airways of mucus, irritants, or foreign particles, and is most commonly caused by a cold, flu, or other minor respiratory infection. Coughs can be dry or produce mucus, and most clear up within a few weeks as the underlying cause resolves.
A cough lasting more than three weeks (a "chronic" cough) can have a range of causes, including postnasal drip, acid reflux, asthma, or, less commonly, other underlying conditions, and is worth discussing with a doctor to identify the cause and appropriate treatment.
02 · Understand
Clinical context
A lingering cough after an infection is common
It's common for a cough to persist for several weeks after a cold or chest infection has otherwise resolved, as the airways gradually settle — this alone isn't usually a cause for concern.
03 · Act
When to See a Doctor
- 1A cough lasts longer than three weeks
- 2You have unexplained weight loss alongside a persistent cough
- 3You have a high fever, or the cough is getting significantly worse
- 4You smoke and have a new or changing cough
04 · Prevent & manage
Practical steps
Over-the-Counter Cough Medicines Have Limited Evidence of Effectiveness
Many over-the-counter cough remedies have limited evidence for actually reducing cough, though some people find simple measures like honey and warm drinks equally or more soothing.
- 1Stay hydrated.This helps keep mucus thin and can soothe an irritated throat.
- 2Try honey and warm drinks.These can help soothe a cough, particularly helpful for adults and children over one year old (honey shouldn't be given to babies under 12 months).
- 3Avoid smoking and smoky environments.These further irritate the airways and can prolong a cough.
- 4See a doctor if the cough persists beyond three weeks.This helps identify the underlying cause and appropriate treatment.
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
A cough is a common, usually short-lived symptom of minor respiratory infections, resolving within a few weeks in most cases.
A cough lasting more than three weeks should always be checked by a doctor to identify the underlying cause.