why do we cough during a cold
Coughs are an ever-present wintertime companion. But does coughing serve any purpose at all, or is it just a clever method that viruses use to spread? is a normal reflex to clear the airway of small particles, microorganisms, mucus, or food or drinks accidentally going down "the wrong pipe. " But when we are plagued with a pesky cold or
infection, cough takes on a new dimension. What often starts as a tickle in the throat at the first sign of an upper respiratory tract infection can easily turn into a full-blown dry cough, most likely followed by a hacking, mucus-producing cough that can be very uncomfortable. Why do we cough when we have a flu or cold infection? We examine what research has revealed about the mechanisms behind cough and who benefits: the virus, or us? In an in the journal BMJ Open Respiratory Research, Prof. Alyn Morice в head of respiratory medicine at the Centre for Cardiovascular and Metabolic Research at Hull York Medical School in the United Kingdom в explains how difficult it is to study coughing.
Humans naturally infected with rhinovirus, which is the cause of the common cold, or the flu virus, which causes, do not make good study subjects as their symptoms vary greatly from person to person. Instead, cells from our airways and guinea pigs are the models of choice when it comes to studying cough. While scientists can't agree on one definitive mechanism that elicits the bellowing cough that you might be listening to while reading this article, there are several theories, says Prof. Morice. Inflammation, cell damage, and mucus Cold and flu viruses attack our bodies through our nasal lining. In response, our immune systems try to fight back by opening a pandora's box of inflammatory chemicals. Prof. Morice goes on to explain that human rhinovirus infection is known to lead to high levels of pro-inflammatory molecules, such as bradykinin в also implicated in causing в tachykinins, calcitonin gene-related peptide, and leukotrienes. While these play important roles in the battle against the common cold, some scientists point the finger squarely at these molecules as the reason for our cough.
Damage to the cell lining in our airways is common in influenza infections and may be why we tend to experience more severe coughing fits with flu than with the common cold, others think. Mucus production is also in the mix of factors to lay the blame on, as it is known to stimulate nerve receptors. This leads us to the crux of cough: nerve endings in our airways. Cough is a neuronal reflex, mediated by the. The nerve endings responsible sit at the level of our larynx or lower in our airways, and cough signals must penetrate this far into the airway to cause symptoms. That's why colds confined to the nose and head в so-called head colds в don't tend to cause cough, Prof. Ron Eccles, who was previously director of the Common Cold Centre in the School of Biosciences at the University of Cardiff in the U. K. So, it seems that cough comes to no advantage to ourselves. The most common form of cough is caused by upper respiratory tract infections and has no benefit to the host. " Prof.
Alyn Morice The beneficiaries are the viruses at the root of our infections in the first place. They hijack coughs to their nasty offspring among the general population, while we are left paying the price with yet another coughing fit. The good news is that most coughs clear up within 3 weeks, although some в known as postviral or postinfectious cough в can last for up to 8 weeks. Unfortunately, there is to suggest that cough medicines are effective in easing your cough. Check out our list of for treating a cold, and find out whether or not is likely to provide you with some much-needed relief. Got a? Experts say it's the top reason people see a doctor -- more than 30 million visits a year. Your first step toward relief is to find out the cause. Then consider your symptoms. With that info, you can choose the best treatment. What Causes It? A is supposed to protect you. It gets out stuff that doesn't belong in your and windpipe, like inhaled dirt or food.
Here are the common triggers. Viruses. and the are the most common causes. While annoying, that are БproductiveБ get germy mucus out of your when you're sick. Most will go away in a few days. After a cold, though, some "dry" last weeks or months. That could be because irritates your lungs, which leads to more, which irritates your lungs, and so on. If you have them, inhaling trigger like can cause your lungs to overreact. They're trying to cough out whatБs bothering them. Irritants. Even if you're not allergic, things like cold air, cigarette smoke, or strong perfumes, can set off a hacking spell. When you're congested, mucus drips down from your nose into your throat, and makes you cough. You can get from, infections, and other problems. When you have, acids back up into your throat, especially at night. They can irritate your windpipe and make you cough. Other causes. Many other problems -- lung, and drug side effects -- can be triggers. Get that won't go away checked out to make sure you donБt have a separate problem.
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