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A cough is a reflex action to clear your airways of mucus and irritants such as dust or smoke. It's rarely a sign of anything serious.
A "dry cough" means it's tickly and doesn't produce any phlegm (thick mucus). A "chesty cough" means phlegm is produced to help clear your airways.
Most coughs clear up within three weeks and don't require any treatment. For more persistent coughs, it's a good idea to see your GP so they can investigate the cause. Find out when to see your GP.
Some of the main causes of short-term (acute) and persistent (chronic) coughs are outlined below.
Common causes of a short-term cough include:
In rare cases, a short-term cough may be the first sign of a health condition that causes a persistent cough.
A persistent cough may be caused by:
Coughs in children often have similar causes to those mentioned above. For example, respiratory tract infections, asthma and GORD can all affect children.
Causes of coughs that are more common in children than adults include:
Occasionally, a persistent cough in a child can be a sign of a serious long-term condition, such as cystic fibrosis.
There's usually no need to see your GP if you or your child have a mild cough for a week or two. However, you should seek medical advice if:
If your GP is unsure what's causing your cough, they may refer you to a hospital specialist for an assessment. They may also request some tests, such as a chest X-ray, allergy tests, breathing tests, and an analysis of a sample of your phlegm to check for infection.
Treatment isn't always necessary for mild, short-term coughs because it's likely to be a viral infection that will get better on its own within a few weeks. You can look after yourself at home by resting, drinking plenty of fluids, and taking painkillers such as paracetamol or ibuprofen.
Although some people find them helpful, medicines that claim to suppress your cough or stop you bringing up phlegm are not usually recommended. This is because there's little evidence to suggest they're any more effective than simple home remedies, and they're not suitable for everyone.
The Medicines and Healthcare products Regulatory Agency (MHRA) recommends that over-the-counter cough and cold medicines shouldn't be given to children under the age of six. Children aged 6 to 12 should only use them on the advice of a doctor or pharmacist.
A homemade remedy containing honey and lemon is likely to be just as useful and safer to take. Honey shouldn't be given to babies under the age of one because of the risk of infant botulism.
If your cough has a specific cause, treating this may help. For example:
If you smoke, quitting is also likely to help improve your cough. Read more about stopping smoking.