Katrina Rosales
Fragrances are made up of dozens of compounds or synthetic volatile chemicals that create an odour. Some of these chemicals can irritate our sinuses and cause headaches. In some cases, a person may be allergic to a chemical element that creates a particular smell. Fragrance sensitivity is also common among people with migraines. According to the American Headache Society, osmophobia, or an aversion to certain smells, can trigger migraines and worsen its symptoms.
| Characteristics | Values |
|---|---|
| Fragrance compounds | Can cross the blood-brain barrier and interact with receptors in the central nervous system |
| Odors | Can trigger migraine episodes |
| Vasodilation | Can activate sensory receptors in the blood vessels, causing headache pain |
| Negative associations | Can cause a fight or flight stress response |
| Allergies | Can cause allergy-like symptoms, including watering eyes, runny noses, and headaches |
| Fragrance sensitivity | Can lead to migraine episodes, asthma attacks, neurological problems, and skin irritations |
| Osmophobia | Defined as an aversion, fear, or psychological hypersensitivity to smell |
| Olfactory hallucinations | Can occur in rare cases |
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What You'll Learn
Fragrance sensitivity and allergies
Perfumes and other strong odours may trigger headaches, migraine episodes, and many other symptoms in some people. Some individuals may experience fragrance sensitivity, and research suggests that osmophobia, or an aversion to odours, is common among people with migraines. A 2016 study on 113 people noted that odours were a common trigger for migraines, affecting 90.2% of the study participants, with perfume odour being the most common trigger, followed by cleaning products, cigarette smoke, and motor vehicle exhaust.
The chemicals that activate the smell signals in our brain (called odorants) can sometimes irritate our sinuses. Smoke, perfume, and chlorine are some of the most common odorants that cause irritation. Our sinuses comprise four distinct, air-filled cavities in the bones of our face, each lined with a mucus-secreting membrane. The mucus traps particles and bugs that come in through our nose and mouth. However, to clear these trapped particles or potential irritants, the body needs to produce more and more mucus, resulting in allergy-like symptoms. This, in turn, causes our immune system to kick in and help out, which results in vasodilation and inflammation, which can lead to a headache.
Additionally, some odours may act directly on the trigeminal pathway, which transmits sensory signals to the brain. When this pathway is stimulated, it causes inflammation because it detects a threat that only the immune system can address. Chemical smells such as formaldehyde, certain cleaning products, and cigarette smoke are known to act directly on the trigeminal pathway.
If you experience frequent migraine symptoms that interfere with your daily life, it is recommended to speak with a doctor to determine possible causes and triggers of a migraine episode and receive appropriate treatment.
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Odors and the trigeminal pathway
The trigeminal nerve plays a crucial role in detecting and responding to volatile chemicals in the nose, along with the olfactory system. While the olfactory system is responsible for the sense of smell, the trigeminal nerve detects irritants and triggers protective reflexes such as respiratory, secretory, and cardiovascular responses when exposed to high concentrations of irritating vapors. This dual detection system is known as the "dual olfactory-trigeminal system."
The dual olfactory-trigeminal system explains why certain odors, especially those with strong fragrances, can trigger headaches. Fragrances contain volatile chemicals that evaporate at room temperature and can be detected by the olfactory and trigeminal systems. When exposed to these chemicals, some individuals may experience a negative emotional response due to the association of the smell with unpleasant memories or experiences. This can lead to a fight-or-flight stress response, contributing to headache development.
Additionally, the chemicals in fragrances can irritate the sinuses, causing the body to produce more mucus to trap and clear these irritants. This triggers an immune response, resulting in vasodilation and inflammation, which can also lead to headaches. The trigeminal pathway, or the trigeminal nerve, detects this inflammation and signals a threat to the brain, further contributing to the headache experience.
While the exact mechanism of how odors trigger headaches is not fully understood, it is believed that fragrances interact with the trigeminal nociceptive pathway. This pathway is responsible for transmitting sensory signals from the head to the brain, and its stimulation can cause inflammation and headache pain.
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Blood vessel dilation
Fragrances and perfumes are made up of many compounds or synthetic volatile chemicals that create an odour. These chemicals can irritate our sinuses and even interact directly with receptors in our central nervous system. This can lead to immediate changes in body functions, including blood pressure, brain activity, and pulse rate.
Vasodilation, also known as vasorelaxation, is the widening of blood vessels. It is a natural process that increases blood flow and provides extra oxygen and nutrients to the tissues that need them the most. This process is controlled by the muscles in the blood vessel walls, which determine how wide or narrow the vessels are at any given time. When the muscles in these walls relax, the blood vessels dilate, and blood flow increases.
Vasodilation is often triggered by a localized need for oxygen, but it can also occur when tissues are not receiving enough glucose, lipids, or other nutrients. It is also a common response to infection, as it helps the body fight the infection and repair any damage. Additionally, vasodilation can be caused by certain foods, drinks, medications, and fragrances.
In some cases, vasodilation can have negative effects on the body, such as a large drop in blood pressure, which can lead to conditions like hypotension and chronic inflammatory diseases. Doctors may prescribe medications called vasoconstrictors to narrow the blood vessels and help regulate blood pressure.
While the exact mechanism is not fully understood, it is believed that the irritation and inflammation caused by certain fragrances can trigger vasodilation in the blood vessels of the head and neck. This, in turn, activates sensory receptors that we perceive as headache pain.
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Emotional response to smells
Our sense of smell is closely linked with our emotions. Research has shown that our body odour, produced by the genes that make up our immune system, can help us subconsciously choose our partners. Kissing is thought by some scientists to have evolved from sniffing, with that first kiss being a primal behaviour during which we smell and taste our partner to decide if they are a match.
Smell is the only fully developed sense a foetus has in the womb, and it is the most developed sense in a child until the age of around 10 when sight takes over. Because of this, childhood tends to be the period in which we create the basis for the smells we will like and dislike for the rest of our lives.
The olfactory bulb, the structure in the front of the brain, processes smells and sends information to other areas of the body's central command for further processing. Odours take a direct route to the limbic system, including the amygdala and the hippocampus, the regions related to emotion and memory. This is why we don't just perceive a smell based on the odour chemicals presented to us, but together with all our memories of that smell, including the way it makes us feel, our past memories, and our present mood.
For example, if you smell something you associate with a negative memory, it may cause those negative emotions to come rushing back, leading your body to generate a fight-or-flight stress response. This can result in immediate changes in body functions, including blood pressure, brain activity, and pulse rate.
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Osmophobia
Fragrances and perfumes are made up of several compounds or synthetic volatile chemicals that create an odour. These chemicals can sometimes irritate our sinuses, leading to headaches. While the scent of a strong, floral perfume may be appealing to some, it may trigger a headache in others. This is known as osmophobia, which is defined as a fear, aversion, or psychological hypersensitivity to odours.
The sense of smell is unique in that it has a direct link to our emotional system. This is because smell is the first sense that humans developed. Therefore, we perceive smells not only based on the odour chemicals but also through the associations and memories we have of that smell. For instance, a particular fragrance may remind someone of a negative memory, causing a fight or flight stress response in their body.
Additionally, some odours may act directly on the trigeminal pathway, which transmits sensory signals to the brain. This pathway detects a threat and stimulates an immune response, resulting in inflammation and a headache. Certain chemical smells, such as cleaning products and cigarette smoke, are known to act on this pathway.
If you experience osmophobia, it is recommended to identify the specific scents that trigger your headaches and avoid them as much as possible. Unpleasant symptoms can be managed with fresh air and painkillers.
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Frequently asked questions
Fragrances are made up of dozens of compounds or synthetic volatile chemicals that create an odour. These chemicals can irritate our sinuses and even cause an allergic reaction. Some people also experience fragrance sensitivity, which can lead to migraine episodes.
Fragrance sensitivity, also known as osmophobia, is an aversion or psychological hypersensitivity to smell. It is estimated that around 30% of people may have sensitivities to certain odours.
If you experience fragrance-induced headaches, it is best to avoid strong scents as much as possible. Opt for natural, plant-powered products or unscented products that use natural fragrances. When using scented products, do so in a well-ventilated area.
Yes, fragrances can trigger migraines. A 2016 study found that odours were a common trigger for migraines, with perfume odour being the most common trigger.
If you experience frequent migraines that interfere with your daily life, it is important to speak to a doctor. A healthcare professional can help identify potential triggers and recommend appropriate treatment.
