
Many people enjoy lighting scented candles to create a pleasant atmosphere in their homes. However, some individuals have reported experiencing sore throats and other adverse reactions after being exposed to candles. While candles are not considered dangerous to one's health, certain candle ingredients and fragrances can trigger allergies or irritate the airways, leading to symptoms such as a sore or itchy throat, coughing, and respiratory issues. It is recommended to ensure proper ventilation when burning candles and to opt for natural candles or those fragranced with essential oils to minimize potential irritation.
| Characteristics | Values |
|---|---|
| Cause | Allergic reaction to candle wax, scent, wick, or particulate produced by the candle when burnt |
| Symptoms | Sore throat, runny nose, coughing, sneezing, itchy eyes, sinus problems, headaches, rashes, chest pain, trouble swallowing |
| Prevention | Use natural candles, switch to essential oils, stay further away from the candle, keep doors and windows open, use an air purifier |
| Treatment | Allergy shots or oral allergy drops |
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What You'll Learn

Allergies and asthma
If you experience a sore throat or other symptoms such as a stuffy nose, itchy eyes, sinus problems, headaches, or rashes when you're near a candle, you may be experiencing an allergy or an asthma attack. While candles can make your home smell nice and feel cosy, about one in five people react to candles with symptoms that can include sneezing, a runny or stuffy nose, coughing, and wheezing.
Candles can release volatile organic compounds (VOCs) into the air, including toluene and benzene, which can irritate your eyes, nose, throat, and skin, and cause headaches, dizziness, and anxiety. Synthetic fragrances are made up of hundreds of different chemicals that can trigger allergic reactions, and you may be allergic to either the candle wax or the scent.
If you have allergies or asthma, scented candles could be triggering attacks without you knowing. Sore throats can be a symptom of asthma, which can be triggered by candles. If you are experiencing these symptoms, you should consult a doctor, who may be able to prescribe sublingual immunotherapy (oral allergy drops) or subcutaneous immunotherapy (allergy shots) to help desensitize your body to allergens.
To avoid allergic reactions to candles, you can try switching to non-scented natural candles or candles fragranced with essential oils, which are less likely to irritate your throat. You can also try to keep doors and windows open for ventilation, use an air purifier, and trim the wick of your candle to ensure the flame is not too large or smoking.
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Volatile organic compounds (VOCs)
Candles are loved for their ability to create a cosy atmosphere, soothing light, and pleasant fragrances. However, while enhancing living spaces, they may also pose hidden health risks. Volatile organic compounds (VOCs) emitted from many candles can potentially harm indoor air quality and our health.
Volatile organic compounds, or VOCs, are chemicals that easily become vapours or gases at room temperature. Many household products, including candles, can emit VOCs and negatively impact indoor air quality. In candles, VOCs can originate from the wax, fragrance, and wicks. Common VOCs released by burning candles include benzene, toluene, formaldehyde, and acetaldehyde, which are linked to various health issues. For example, toluene exposure without proper ventilation can irritate the eyes, nose, throat, and skin, as well as cause headaches, dizziness, confusion, and anxiety. Formaldehyde, another VOC present in candles, has been linked to more serious health problems, including cancer.
The impact of candles on health is a topic of debate within the medical and scientific community. While some people experience scratchy throats, stuffy noses, and coughing from burning candles, others do not seem to be affected. The science is not strong enough to suggest that candles are a significant danger to health, and there are far higher-risk activities, such as indoor cooking, which increase particulate matter in the air and have been linked to respiratory illnesses.
To minimise potential health risks, it is recommended to take certain precautions when using candles. This includes ensuring proper ventilation in the room, choosing candles made from natural waxes such as soy, beeswax, or coconut wax, avoiding synthetic fragrances, and selecting candles with cotton or wood wicks instead of metal cores. Additionally, trimming the wick before lighting and burning candles for shorter periods can help reduce soot production and overall emissions.
By making informed choices and embracing natural alternatives, it is possible to maintain a fresh-smelling and pleasant living environment without compromising indoor air quality and personal health.
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Indoor air pollution
Burning candles can emit small particles and gases that contribute to indoor air pollution. While the impact of candle emissions on health is debated within the medical and scientific community, certain types of candles can add toxic pollutants to indoor air. For example, paraffin wax candles, which are derived from petroleum, release some of the same carcinogenic chemicals as diesel fuel, including benzene, toluene, formaldehyde, and acetaldehyde. Candles also release soot, which can stain walls and furniture and contaminate ventilation systems. Scented candles tend to produce more soot than unscented candles due to the synthetic fragrance they contain.
The release of volatile organic compounds (VOCs) or hydrocarbons by candles is another concern. These compounds, composed of hydrogen and carbon, can have irritant effects on the eyes, nose, throat, and skin, as well as cause headaches, dizziness, confusion, and anxiety. Toluene, a common VOC found in candles, is used in paint thinners and adhesives and can cause these adverse effects if exposure occurs without proper ventilation. Additionally, benzene, another VOC emitted by candles, is a gas typically associated with forest fires, volcanoes, and the burning of coal or oil.
While the scientific evidence is not strong enough to suggest that candles pose a significant danger to health, individuals with certain health conditions may need to exercise caution. For instance, Dr. Dixon advises people with bladder cancer or chronic lung conditions like chronic obstructive pulmonary disease (COPD) to be mindful of the levels of air pollution in their homes. However, it's important to note that everyday activities like indoor cooking can increase particulate matter and have been linked to respiratory illnesses.
To minimize the potential impact of candle burning on indoor air quality, it is recommended to choose candles wisely and opt for high-quality options. Additionally, ensuring proper ventilation in the space where candles are burned can help dissipate any emissions. Considering alternatives such as candle warmers, essential oil diffusers, or electric space heaters can also reduce the risk of indoor air pollution while still creating a cozy atmosphere.
Some individuals have reported experiencing sore throats, scratchy throats, or closed-up throats after being near certain candles. This could be due to sensitivity to particular oils used in the candles or the release of irritant compounds. However, it is important to note that not all candles seem to cause these issues, and the specific candle brand or formula may play a role.
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Candle ingredients and quality
While there is no definitive scientific evidence that candles are harmful to health, some people have reported experiencing a sore throat, itchy cough, and respiratory irritation after prolonged exposure to candles. This could be due to various ingredients and compounds found in candles, including fragrance oils, wax types, and wicks.
Candle wax is typically made from paraffin, which is derived from petroleum oil. While affordable and easily accessible, paraffin wax produces harmful byproducts when burned and can release fumes that irritate the eyes and respiratory system. Other types of candle wax include beeswax, soy wax, palm wax, gels, and synthesized waxes. Soy wax, in particular, is marketed as a natural and non-toxic alternative, although some individuals have reported adverse reactions to it.
The wicks of a candle are another important consideration. Historically, wicks contained a lead core, which could cause lead poisoning. However, lead-cored wicks have been banned since 2003. Nowadays, most wicks are made from cotton with a paper, zinc, tin, or cotton core. Cotton wicks are preferred for a cleaner burn, as zinc and tin cores can lead to high-temperature burning and flare-ups.
Fragrance oils are commonly added to candles to enhance their scent. These oils can be natural or synthetic, and both types can be toxic in certain doses. However, the amount of fragrance oil in candles is generally considered safe and not harmful to humans. Candle manufacturers work closely with fragrance companies to ensure that their products are safe and properly formulated.
To minimize any potential risks associated with candle usage, it is recommended to invest in high-quality candles and always burn them in well-ventilated areas. Additionally, setting timers for candle burning and avoiding burning multiple candles simultaneously can help reduce indoor air pollution and minimize any potential irritation.
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Proper burning techniques
While there isn't enough scientific evidence to suggest that candles are dangerous to your health, some people have reported experiencing a sore throat, itchy cough, and sinus irritation from burning certain candles. To ensure you're taking all the proper fire safety and health precautions, here are some tips for proper candle-burning techniques:
Choosing the Right Candle
When purchasing candles, opt for high-quality candles with natural components like essential oils and premium wax blends. These candles typically provide a stronger and longer-lasting scent. Soy wax candles, for example, are marketed as a non-toxic alternative, but some people have reported adverse reactions to organic materials.
Trimming the Wick
Before lighting your candle for the first time and before each subsequent burn, be sure to trim the wick to about 0.5 cm or 1/4 inch. Trimming the wick helps prevent excessive smoking, soot buildup, and uneven burning. It also prolongs the life of your candle by preventing dripping and flaring.
Allowing the Wax to Pool
When lighting a new candle for the first time, allow it to burn until the wax pool reaches the edge of the container. This helps to fix candle tunneling and promotes an even burn, maximizing the life of your candle.
Burn Duration and Frequency
As a general rule, candles should burn for one hour per inch of diameter. For example, a 2-inch candle should burn for no more than 2 hours at a time. Burning a candle for too long can cause carbon buildup on the wick, leading to an unstable flame and excessive smoke. It's recommended to let the candle cool for at least 2 hours before relighting.
Placement and Ventilation
Place your candle in an area with good air circulation but away from drafts, fans, open windows, or crowded areas. Proper placement helps distribute the fragrance evenly and prevents flickering and smoke. Always burn candles in a well-ventilated space to avoid potential health risks associated with indoor air pollution.
Storage and Leftover Wax
Keep your candles covered and stored in a cool, dark place when not in use. This helps preserve the integrity of the fragrance and ensures a consistent scent experience. Don't let leftover wax go to waste; consider repurposing it with creative and practical solutions.
By following these simple tips, you can enhance your candle-burning experience, maximize the longevity of your candles, and create a pleasant and safe ambiance.
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Frequently asked questions
You may be allergic to the fragrance, wax, wick, or particulate produced by the candle when it's burnt. It could also be a reaction to the volatile organic compounds (VOCs) that are released as the candle burns.
You could try switching to unscented natural candles or candles fragranced with essential oils, which are less likely to irritate your throat. You could also try beeswax or soy wax candles, which are free of many of the chemicals found in standard paraffin candles.
Candles do release VOCs and particulate matter into the air, but the small amount released when you burn a candle is not a significant cause for concern. There isn't enough strong scientific evidence to suggest that candles are a danger to your health.
Symptoms of a candle allergy can include a sore throat, sneezing, a runny or stuffed-up nose, itchy eyes, sinus problems, headaches, rashes, coughing, and wheezing.






































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