
Swallowing a fly while sleeping is an unusual occurrence, but it can happen. While the nursery rhyme I Know an Old Lady Who Swallowed a Fly suggests dire consequences, the reality is usually less dramatic. Most bugs, including flies, are generally safe to ingest, assuming they end up in your esophagus. However, if the fly moves into your trachea or blocks your airway, it can be dangerous. Inhalation of a fly can lead to the insect getting trapped in the mucus layer designed to protect your lungs, but this is uncommon during sleep. For the most part, accidentally swallowing a fly is not a significant cause for concern, and your body will digest it along with other food.
| Characteristics | Values |
|---|---|
| Is swallowing a fly dangerous? | For the most part, swallowing a fly is harmless. However, stinging and biting insects such as bees, wasps, fire ants, and some types of caterpillars can be dangerous. |
| What happens if a fly is swallowed? | The fly will be digested along with other food and will eventually be expelled. |
| What happens if a fly is inhaled? | The fly may get trapped in a layer of mucus designed to protect the lungs. However, there is a risk of the fly moving into the trachea (windpipe) and blocking the airway. |
| Can swallowing a fly lead to infections? | Flies can carry bacteria such as Shigella, which can cause severe and sometimes bloody diarrhea. |
| Are there any long-term effects? | There is no indication of long-term effects specifically from swallowing a fly. However, as with any insect consumption, there may be potential risks associated with specific types of insects or individual allergies. |
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What You'll Learn

It's unlikely to be dangerous
While the idea of swallowing a fly may be off-putting, it is unlikely to be dangerous to your health. According to Dr. Diane Gorgas, the director of Emergency Medicine at The Ohio State University Wexner Medical Center, most bugs, including houseflies, are generally safe to ingest as long as they end up in your oesophagus.
In fact, insects are a significant source of protein in many diets around the world. Your body can digest flies and other arthropods, such as spiders, mites, ticks, gnats, mosquitoes, and bedbugs, just like any other food. Eating a bug occasionally is unlikely to cause harm to most people.
However, it is important to note that certain insects, particularly those that can sting or bite, such as bees, wasps, fire ants, and some types of caterpillars, can pose a risk if swallowed. If you have an allergy to the insect, it can trigger a severe and potentially life-threatening allergic reaction, similar to being stung elsewhere on your body. Additionally, if the bug moves down into your trachea (windpipe) and blocks your airway, it can be dangerous. Coughing will usually expel the bug, but it is a concern if it moves significantly below the vocal cords.
While flies themselves are not inherently dangerous to swallow, they can sometimes carry bacteria, such as Shigella, on their feet. This bacteria can cause severe and bloody diarrhoea, which usually resolves within a week but may require antibiotics in severe cases. Nevertheless, the risk of contracting such an infection from swallowing a fly is relatively low.
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It could cause breathing difficulties
While swallowing a fly is generally harmless, there are some risks associated with it. One of the main concerns is the potential for breathing difficulties, especially if the fly is inhaled and gets into the lungs.
When a fly is inhaled, it can get trapped in the mucus lining of the lungs, which is designed to protect the lungs from foreign objects. While this mechanism usually prevents the fly from causing harm, there is a risk of breathing difficulties if the fly blocks the airway or gets lodged in the trachea (windpipe) below the vocal cords. In such cases, coughing is the body's natural response to expel the fly. However, if the fly moves significantly below the vocal cords, it can become a more serious issue.
People with asthma or other respiratory conditions may be more susceptible to breathing difficulties if they swallow a fly while sleeping. The fly could trigger an asthma attack or exacerbate existing respiratory problems. Additionally, if the fly is still alive and manages to crawl further down the trachea, it could cause choking or aspiration, leading to more severe breathing difficulties.
It is important to note that the risk of breathing difficulties from swallowing a fly is relatively low, and such incidents are uncommon. However, if someone experiences difficulty breathing after swallowing a fly, it is crucial to seek medical attention, especially if they have underlying respiratory conditions.
Furthermore, while flies themselves may not directly cause breathing difficulties, they can carry bacteria and pathogens that can lead to respiratory infections. Flies are known to transmit bacteria such as Shigella, which can cause severe and sometimes bloody diarrhea. Therefore, it is essential to maintain good hygiene and sanitation practices to minimize the risk of exposure to harmful bacteria carried by flies.
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It might carry bacteria
While swallowing a fly is unlikely to cause harm, there are some risks to be aware of. One concern is the potential for the fly to block your airway, especially if it moves below your vocal cords into your trachea or windpipe. Coughing will usually dislodge the fly, but if it gets trapped in your lungs, it will be caught in a layer of mucus designed to protect your lungs.
Another concern is the possibility of bacterial infection. Flies can carry bacteria such as Shigella on their feet, which can cause severe and sometimes bloody diarrhea. This condition typically clears up within a week, but severe cases may require antibiotic treatment.
It is important to note that the act of swallowing a fly is generally considered safe, and the human body can digest arthropods like flies without issue. However, stinging and biting insects, such as bees, wasps, fire ants, and certain caterpillars, can be dangerous if swallowed as they may sting or bite on the way down, causing damage to the mouth and throat.
In addition, while rare, some bugs like certain types of beetles have evolved to survive ingestion if swallowed whole. These beetles can transmit the dwarf tapeworm, even if they are dead when ingested.
Overall, while swallowing a fly is usually harmless, it is always a good idea to be cautious and seek medical advice if you have any concerns or experience any adverse symptoms.
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It could be coughed out
If you swallow a fly in your sleep, it will most likely end up in your stomach and be digested along with your food. However, there is a chance that you might inhale the fly, causing it to get stuck in your trachea or windpipe. In such cases, coughing is the body's natural response to expel the fly.
Coughing is an effective way to clear your airways and prevent choking. The force generated by coughing can help dislodge the fly and push it back up the throat, preventing it from causing any further obstruction. This is especially important if the fly has been inhaled and is blocking the airway.
The act of coughing creates a forceful expulsion of air from the lungs, which generates enough pressure to dislodge and propel the fly out of the trachea. The body's natural gag reflex also plays a role in this process, as it triggers a strong contraction in the throat muscles, further assisting in expelling the fly.
While coughing is a common and effective response to swallowing a fly, it is not the only option. Some people may find that the fly can be dislodged by drinking liquids, particularly carbonated beverages, which can help to loosen the fly's hold and facilitate its expulsion. Additionally, certain throat maneuvers, such as swallowing forcefully or performing a specific set of throat exercises, can also aid in dislodging the fly and encouraging it to move upwards.
In most cases, if a fly is swallowed and becomes lodged in the trachea, coughing will be the body's immediate reaction. This reflexive action is designed to protect the airways and prevent any foreign objects from causing harm. While swallowing a fly may be an unpleasant experience, it is important to remain calm and trust that the body's natural defense mechanisms, including coughing, are well-equipped to handle such incidents.
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It won't survive your digestive system
While swallowing a fly may be alarming, it is unlikely to cause you serious harm. According to experts, your body will digest the fly "just like any other food" or "any other protein-rich food".
The human digestive system is not a welcoming environment for flies, and they have little to no chance of survival. The fly will be digested along with the rest of the contents in your stomach, and any remnants will be eliminated when you use the toilet.
It is worth noting that some people have reported hearing a buzzing noise or feeling a wiggling sensation after swallowing a fly, which can be an uncomfortable experience. However, this is typically not a cause for concern, and the fly will not survive your digestive system.
While swallowing a fly is generally harmless, there are a few rare exceptions to be aware of. For example, if the fly is carrying bacteria such as Shigella on its feet, you may develop severe and sometimes bloody diarrhoea. In most cases, this will resolve on its own within a week, but if symptoms are severe, you may require antibiotics.
Additionally, if you have an allergy to flies or other insects, swallowing one could potentially trigger a severe, life-threatening allergic reaction. If you experience any unusual symptoms after swallowing a fly, such as difficulty breathing, hives, or swelling of the throat or tongue, seek immediate medical attention.
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Frequently asked questions
For the most part, swallowing a fly is harmless and your body will digest it just like any other food. However, if you are allergic to the fly, it could cause a severe, life-threatening allergic reaction.
If the fly goes down your trachea or windpipe, it could block your airway. Coughing will usually expel the fly, but medical attention may be required if it moves significantly below the vocal cords.
Flies can carry bacteria such as Shigella on their feet, which can cause severe and sometimes bloody diarrhea. However, this usually resolves within a week and can be treated with antibiotics if necessary.
There is no need to panic if you swallow a fly. It will likely be digested along with the rest of your food. However, if you experience any adverse reactions, such as difficulty breathing or an allergic reaction, seek medical attention.
No, swallowing a fly will not turn you into a fly!










































