https://www.health.harvard.edu/staying-healthy/that-nagging-cough

Feb 7, 2019 ... A persistent or chronic cough that lasts longer than a few weeks can be ... Coughing expels mucus, microbes, and foreign particles from the ...

https://www.mayoclinic.org/diseases-conditions/chronic-cough/symptoms-causes/syc-20351575

Aug 22, 2017 ... Chronic cough — Comprehensive overview covers causes, ... it helps clear irritants and secretions from your lungs and prevents infection.

https://www.nhsinform.scot/illnesses-and-conditions/lungs-and-airways/cough

A cough is a reflex action to clear your airways of mucus and irritants. ... For more persistent coughs, it's a good idea to see your GP so they can investigate the ...

https://www.medicalnewstoday.com/articles/321597.php

Apr 24, 2018 ... A chronic cough is one that lasts for 8 weeks in adults or 4 weeks in children. It may produce mucus or be dry and tickle the throat. Common ...

https://www.washingtonpost.com/national/health-science/when-should-you-start-worrying-about-that-lingering-cough-give-it-time/2013/12/20/1e615e9c-665d-11e3-ae56-22de072140a2_story.html

Dec 23, 2013 ... Mintz describes two kinds of cough that linger after a cold. One is a postnasal drip or mucus cough, in which your body's attack on the cold virus ...

https://www.verywellhealth.com/constant-cough-symptoms-2248845

An acute cough usually lasts three weeks or less, whereas a chronic cough is ... If you do have phlegm, it may be clear, yellow, green, or even blood-tinged.

https://www.healthline.com/health-news/why-am-i-still-coughing

Jan 17, 2019 ... “Mucus builds up when you have a cold, and your nasal cavity and sinuses ... Other reasons for a persistent cough might include the following:.

https://www.lung.org/lung-health-and-diseases/lung-disease-lookup/cough/cough-symptoms-causes-risks.html

Post-nasal drip (or upper airway cough syndrome): This condition shows up as dry cough caused by the chronic dripping of mucus from the back of the nose to ...

https://www.webmd.com/lung/ss/slideshow-bronchitis-overview

Bronchitis is an inflammation in the lungs that some people call a chest cold. ... cold -- or may follow a more serious condition like a chronic smoker's hack. ... A cough, phlegm, and feeling tired are typical symptoms of bronchitis, but these are also ... Coughing spells are the body's way of trying to clear out these secretions for ...

https://www.mydr.com.au/respiratory-health/cough-productive-or-wet-cough

A productive or 'wet' cough brings up mucus or phlegm. ... condition where the airways are damaged and abnormally wide causing a persistent, wet cough); and  ...