What causes cough? 92 possible conditions
A cough is a common reflex action that clears the throat of mucus or foreign irritants. Coughing to clear the throat is typically an infrequent action, although there are a number of conditions that can cause more frequent bouts of coughing.
In general, a cough that lasts for less than three weeks is an acute cough.
A cough that lasts between three and eight weeks, improving by the end of that period, is a subacute cough.
A persistent cough that lasts more than eight weeks is a chronic cough.
Most cough episodes will clear up, or at least significantly improve, within two weeks. If you cough up blood or have a “barking” cough, talk to your doctor. Any cough that hasn’t improved after a few weeks may be serious and you should see a doctor.
A cough results from a number of conditions, both temporary and permanent.
Clearing the Throat
A cough is a standard way of clearing the throat. When your airways become clogged with mucus or foreign particles such as smoke or dust, a cough is a reflex reaction that attempts to clear the particles and make breathing easier.
Usually, this type of coughing is relatively infrequent, but coughing will increase with exposure to irritants such as smoke.
Viruses and Bacteria
The most common cause of a cough is a respiratory tract infection, such as a cold or flu. Respiratory tract infections are usually caused by a virus and may last from a few days to a week. Infections caused by the flu may take a little longer time to clear up.
Smoking is the second most common cause of coughing. A cough caused by smoking is almost always a chronic cough, with a distinctive sound. It’s often known as “smoker’s lung” or “smoker’s cough.”
The most common cause of coughing in young children is asthma. Typically, asthmatic coughing involves wheezing, making it easy to identify. Mild cases of asthma may just be observed, but more severe cases will require treatment using an inhaler. It is possible for children to grow out of asthma as they get older.
Some medications will cause coughing, although this is generally a rare side effect. Angiotensin-converting enzyme (ACE) inhibitors, commonly used to treat high blood pressure and heart conditions, can cause coughing. Two of the more common brands are known as Zestril and Vasotec. The coughing stops when the medication is discontinued.
Other conditions that may cause a cough include:
- damage to the vocal cords
- postnasal drip
- bacterial infections such as pneumonia, whooping cough, and croup
- serious conditions such as pulmonary embolism and heart failure
Another common condition that can cause chronic cough is gastroesophageal reflux disease (GERD). In this condition, stomach contents flow back into the esophagus. This backflow stimulates a reflex in the trachea, causing the person to cough.
Most coughs will clear up, or at least significantly improve, within two weeks. If you have a cough that hasn’t improved in this amount of time, see a doctor, as it may be a symptom of a more serious problem.
If additional symptoms develop, such as a fever, chest pains, headaches, drowsiness, or confusion, contact your doctor as soon as possible.
Coughing up blood or breathing difficulties require immediate emergency medical attention.
There are a variety of ways to treat a cough, depending on the cause. For healthy adults, most treatments will involve self-care.
A cough that results from a virus can’t be treated with antibiotics. You can, however, soothe it in the following ways:
- Keep hydrated by drinking plenty of water.
- Elevate your head with extra pillows when sleeping.
- Use cough drops to soothe your throat.
- Gargle hot salt water regularly to remove mucus and soothe your throat.
- Avoid irritants, including smoke and dust.
- Add honey or ginger to hot tea to relieve your cough and clear your airway.
- Use decongestant sprays to unblock your nose and ease breathing.
Typically, medical care will involve your doctor looking down your throat, listening to the cough, and asking about any other symptoms.
If your cough is likely due to bacteria, your doctor will prescribe oral antibiotics. You’ll usually need to take the medication for a week to fully cure the cough. She may also prescribe either expectorant cough syrups, or cough suppressants that contain codeine.
If your doctor can’t find a cause for your cough, they may order additional tests. This could include a chest X-ray to assess whether your lungs are clear, along with blood and skin tests if they suspect an allergic response. In some cases, phlegm or mucus may be analyzed for signs of bacteria or tuberculosis.
It’s very rare for a cough to be the only symptom of heart problems, but a doctor may request an echocardiogram to ensure that your heart is functioning correctly and isn’t causing the cough.
Difficult cases may require additional testing. A CT scan offers a more in-depth view of the airways and chest, and it can be useful when determining the cause of the cough. If the CT scan doesn’t show the cause, your doctor may refer you to a gastrointestinal (GI) specialist or a pulmonary (lung) specialist. Some of the testing these specialists may use includes esophageal pH monitoring, which looks for evidence of GERD.
In cases where the previous treatments are either not possible or extremely unlikely to be successful, doctors may prescribe cough suppressants.
In most cases, a cough will disappear naturally within a week or two after it first develops. A cough won’t typically cause any long-lasting damage or symptoms.
In some cases, a severe cough may cause temporary complications such as:
- fractured ribs
These are very rare, and they will normally cease when the cough disappears.
A cough that is the symptom of a more serious condition is unlikely to go away on its own. If left untreated, the condition could worsen and cause other symptoms.
While infrequent coughing is necessary to clear the airways, there are ways you can prevent catching other coughs.
Smoking is the most common cause for a chronic cough. It can be very difficult to cure a “smoker’s cough.” There are a wide variety of methods available to help you stop smoking, from gadgets such as electronic cigarettes to advice groups and support networks. After you stop smoking, you will be much less likely to catch colds or suffer from a chronic cough.
A study in the American Journal of Respiratory and Critical Care Medicine found that people who eat diets high in fruit, fiber, and flavonoids are less likely to suffer from chronic coughs. If you need help to adjust your diet, your doctor may be able to advise you or refer you to a dietitian.
It’s advisable to stay away from anyone suffering from contagious illnesses, such as bronchitis, to avoid coming into contact with germs. You should wash your hands frequently, and not share cutlery, towels, or pillows.
If you have existing medical conditions that increase the chances of developing a cough, such as GERD or asthma, consult your doctor about different management strategies. Once correctly managed, you may find that your cough disappears, or it may become much less frequent.
- Butler, L. M., Koh, W. P., Lee, H. P., Yu, M. C., & London, S. J. (2004, August 1). Dietary fiber and reduced cough with phlegm. American Journal of Respiratory and Critical Care Medicine, 170(3), 279-287. Retrieved from http://www.atsjournals.org/doi/abs/10.1164/rccm.200306-789OC - .Vf3XQZcROVA
- Irwin, R. S. (2006, January). Chronic cough due to gastroesophageal reflux disease. Chest, 129(1_suppl), 80-94. Retrieved from http://journal.publications.chestnet.org/article.aspx?articleID=1084242
- Mayo Clinic Staff. (2013, May 24). Chronic cough. Retrieved from http://www.mayoclinic.org/diseases-conditions/chronic-cough/basics/complications/con-20030883
- The National Lung Health Program. (n.d.). Retrieved from http://www.nlhep.org/Style%20Library/PageSets/PageSet-The_Early_Recognition/national-lung-program-3.html
- When to worry about a cough. (2010, September). Retrieved from http://www.health.harvard.edu/press_releases/when-to-worry-about-a-cough
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