“Anything can cause anything.”
In the early days of the chiropractic profession, that saying referred to the wide-ranging symptoms related to the nervous system. Nowadays, it applies to allergies as well. That’s because, when it comes to allergies, any normal and innocuous substance can produce just about any physical or mental symptom.
What’s an allergy?
Allergies occur when the immune system forms a response against a non-infectious substance in the environment (allergen). In most allergic disorders—including allergic asthma, hay fever, and food allergies—the body produces antibodies called Immunoglobulin E (IgE) and T helper 2 (TH2) cells that recognize tiny particles of the allergen (antigens).
When your body is first exposed to the allergen, it creates IgE. That’s called sensitization. Then, when you’re exposed again, the body recognizes the antigen and produces the allergic reaction. Common antigens include pollen from grass and trees, pets, house dust, certain foods and drugs, and insect venoms. 
Many people are allergic to animal dander, the flecks of dead skin that all mammals shed. If you’re allergic to cats, you’re probably reacting to Felis domesticus allergen 1, a protein in cats’ saliva that gets transferred to their fur when they groom themselves. Between 10% and 30% of people have cat allergies. 
Even more common than cat allergies is dust allergy. In 1967, scientists discovered that dust itself isn’t allergenic. Rather, it’s the microscopic components of house dust that lead to allergic asthma or allergic rhinitis. Dust includes human skin flakes, which invisible dust mites eat. The mites excrete waste products that can become airborne and find their way into people’s lungs. 
Allergies are caused by allergens—which are substances that cause allergies! That’s a circular answer that doesn’t get us anywhere. More specifically, why does the body react the way it does? And why do some people suffer from allergies while others don’t?
The body responds to allergens the same way it responds to a tick bite or an internal infection by parasitic worms. It’s as if something tricks the body into believing that an everyday substance is a harmful parasite.
Let’s take it step by step. When you’re first exposed to an allergen—whether pollen, dust, or a certain food—your immune system produces antibodies to that specific molecule. The next time you’re exposed, the IgE antibodies spring into action and trigger a response that lasts a day or two and involves many different types of immune cells like eosinophils, leukocytes, and T helper cells. These cells produce swelling, inflammation, and tissue changes.
If you continue to be exposed to the substance, either constantly or intermittently, chronic inflammation sets in as immune cells remain active, causing changes to the function and structure of affected organs, like your respiratory tract or skin. The long-term consequences of chronic inflammation produce the “burden of disease” among those with allergies—nagging symptoms, reduced quality of life, work days lost, doctor visits, and so on.
In people who have a particular genetic make-up, chronic inflammation can result in a decrease of the barrier function of epithelial cells. Your skin, respiratory tract, lungs, and digestive tract are all lined with epithelial cells that are supposed to keep bad stuff out as they let good stuff through. About 10% of people with European ancestry have a genetic mutation that allows the skin to lose some of its barrier function, predisposing them to atopic dermatitis.
Genetic research has identified other genes and mutations that make people more likely to develop allergies. In general, allergies are tied to both environmental and hereditary factors.
There’s no doubt that allergic and immune disorders have become more commonplace in industrialized societies over the last 30 years. As infectious diseases go down in countries, allergic and autoimmune diseases go up. And as the socioeconomic level of a society or family rises, so does the incidence of asthma, Crohn’s disease, and atopic dermatitis.  Could growing up in an environment that’s too clean negatively affect the immune system? That’s what the hygiene hypothesis proposes.
There are many theories about how this might happen. As mentioned above, allergic responses mirror the body’s response to parasites. One version of the hygiene hypothesis suggests that exposure to natural germs and parasites in the early years of life trains children’s immune systems to keep the two types of T helper cells (TH1 and TH2) in balance. TH1 reins in some of
the inflammatory responses, but TH2 doesn’t. A TH1 response develops from exposure to parasites; TH2 is the primary response in infants and in allergies. 
Interestingly, exposure to animals early in life may protect children from some allergies later on. Studies show that children who grew up on farms were less likely to have hay fever, asthma, or dermatitis.  Even having a cat or dog in the home during infancy seems to protect kids from allergies later in childhood. 
Since the microbiota of the gut has an impact on lungs through the gut-lung axis and on the skin through the gut-skin axis, researchers are investigating whether probiotic supplementation could prevent allergies in kids. [internal link] One recent study found that a specific probiotic strain, Lactobacillus rhamnosus, could prevent eczema in children who had a genetic predisposition toward that condition.
Over 25 million Americans have asthma, and over 7 million of those are children and teenagers.  It’s the most prevalent non-communicable disease in kids. Asthma is an obstructive airway and chronic inflammatory disorder. Due to inflammation, respiratory passages swell, the muscles of the bronchial tubes constrict, and extra mucus is secreted, limiting the flow of exhaled air. During an asthma attack, which can happen several times a week or even daily, the person feels a tightening in the chest, finds it hard to get a full breath, coughs, and wheezes. Corticosteroid inhalers and other medications are often prescribed, and patients are advised to be tested for and avoid allergens.
Although allergens like pollen, dust, and pets can produce asthma symptoms or attacks, so can other environmental factors. Emotional upset, pollutants, tobacco smoke, and fumes can make symptoms worse. 
An obvious response toward allergies is avoidance. It makes sense that if something is making you feel sick, you should stay away from that substance if you can. But that can be easier said than done—especially with airborne allergens like dust or pollen. The Mayo Clinic gives a room-by-room plan for allergy-proofing your home. Avoidance strategies can be time-consuming, expensive, and intrusive—but many people prefer these measures to taking drugs that can have unwanted side effects. Simple efforts like putting a plastic barrier over mattresses and pillows take little effort but can reduce symptoms. 
What if you don’t want to get rid of your cat, tear up your carpet and replace it with wood flooring, or move to a part of the country where ragweed doesn’t grow?
Immunotherapy has been used for decades to treat or eliminate specific allergies. It can be given by injection (allergy shots) or sublingually (pills or drops under the tongue). According to the Asthma and Allergy Foundation of America, the treatments work best for people with allergies to pollen, pets, dust, and bee stings and for those with allergic asthma. They’re not as effective for food allergies, drug allergies, or eczema.
NAET (Nambudripad’s Allergy Elimnation Technique) and similar techniques are complementary and alternative medicine (CAM) approaches that apply elements of Eastern and Western medicine to allergies and sensitivities. While the person receiving the therapy holds onto the allergen, the practitioner uses kinesiology and acupressure to “reprogram” the body to
stop reacting to the substance. According to published case studies, food allergies that produced eczema and more severe reactions were cleared using this approach.  Although it’s not a mainstream therapy, it may appeal to those who prefer using CAM before trying more invasive approaches.
Are allergies dangerous? Allergies cause a wide spectrum of symptoms and disease burden. For some, their seasonal hay fever means taking over-the-counter antihistamines a few weeks every summer. For others, year-round rhinitis leads to constant discomfort and causes nasal polyps to develop. Others suffer with unsightly, itchy patches of eczema that can become infected. And people with allergic asthma find they must cut back on their activities because exercise can bring
on an attack or even land them in the emergency department.
No matter where you are on that spectrum, taking steps to reduce the allergenic load makes sense. Many people who start out with just one type of allergic disorder, like atopic dermatitis, go on to develop additional problems like allergic rhinitis and allergic asthma. This is known as the “allergic march.” 
These three major manifestations of allergies—dermatitis, allergic rhinitis, and asthma—form what’s known as the atopic triad. The allergic march ends with having two or three “comorbidities,” but because of the underlying mechanisms they share, treatment approaches are often the same, making the triad easier to deal with than three separate health problems.
Imagine a bucket containing all the inflammation-inducing events your body encounters each day. Normally, your body has the capacity to handle the onslaughts of infectious invaders, environmental toxins, and processed foods that pour into the bucket. But every allergen takes up space in the bucket, eventually causing it to overflow. That’s when allergic symptoms happen, and the signs of inflammation in your body become impossible to ignore. But if you can eliminate some of those allergens, the overall burden on your system is less, so your symptoms may be less severe—and you’ll be at lower risk for developing additional allergic disorders.
Now imagine you can change the size of the bucket. Shrinking the bucket means you have less capacity to respond to inflammatory triggers. Stress and lack of restful sleep shrink your bucket.
How can you create a bigger bucket? Make sure you’re eating an anti-inflammatory diet and drinking plenty of pure water so your body can efficiently flush out toxins. Various fruits, vegetables, and herbs have different antioxidant and anti-
inflammatory properties, so eating a diet rich in plant foods is important. But given our busy lifestyles and picky taste buds, we don’t always have the time or inclination to eat as well as we should. So-called superfood drinks make it easy. One study found that consuming a single serving of a polyphenol-rich beverage (fruits and greens shake) produced immediate reductions in inflammatory markers in the blood. 
Only about half of people who have asthma are able to satisfactorily control their symptoms with medications. For that reason, natural remedies are being studied extensively. Magnesium sulfate may be given by IV as an emergency procedure for a severe asthma attack, so it seems reasonable to expect that taking magnesium supplements could help prevent asthma symptoms. Magnesium is a known bronchodilator—that is, it helps widen the passages of the respiratory tract by relaxing the musculature. Not all studies have shown magnesium supplementation to help with asthma.  That could be the result of the kind of magnesium used in the studies because some forms of magnesium aren’t well absorbed. Make sure to choose a bioavailable chelated formula.
Because inflammation plays a central role in all types of allergic reactions, it’s a primary focus of natural therapies for dermatitis, allergic rhinitis, and asthma. Research has identified scores of powerful natural anti-inflammatories and antihistamines that can down-regulate the cells and processes of the immune system that accompany chronic inflammation. Many of these are available as nutritional supplements.
For example, quercetin, a flavonoid found in fruits and vegetables, has been shown to decrease all asthmatic symptoms in allergic mice by switching the TH1/TH2 balance toward the less-inflammatory TH1 and lowering other pro-inflammatory markers.  Quercetin is noted for its natural anti-histamine properties.
 Turmeric, ginseng, ginger, boswellia (Indian frankincense), green tea extract, cranberry, pomegranate, hops, licorice, stinging nettle, and black pepper all have proven anti-inflammatory properties. Butterbur root has been used for centuries to treat asthma, and a 2004 study found that an extract of butterbur root reduced the frequency and severity of asthma attacks.  Since then, ongoing research suggest that it may help prevent migraine headaches and act as a natural antihistamine for allergic rhinitis.
 Some safety issues were raised about butterbur in Europe, so make sure you use only purified extracts and professional grade supplements. And use all herbal and nutritional preparations under the guidance of your trusted healthcare provider.
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7 Morgan, A.R.; Han, D.Y.; Wickens, K.; Barthow, C.; Mitchell, E.A.; Stanley, T.V.; Dekker, J.; Crane, J.; Ferguson, L.R. Differential modification of genetic susceptibility to childhood eczema by two probiotics. Clin. Exp. Allergy 2014, 44, 1255–1265.
8 Chabra R, Gupta M. Allergic And Environmental Induced Asthma. [Updated 2021 Mar 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK526018/
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Here's our bottom line for allergies:
Limit what you put in your allergy bucket.
· Don’t shrink your bucket.
· Get a bigger bucket.
This strategy can provide real relief from allergy symptoms.
Here are our favorite supplements for addressing allergies.
Nutridyn Fruits & Greens:
For the antioxidant and anti-inflammatory power of 20+ fruits and vegetables, mix yourself a daily drink of this product that comes in a variety of great flavors. It’s an easy way to get the benefits of a wide range of superfoods all at once, including quercetin, cranberry, pomegranate, green tea extract, ginger, and turmeric. It even contains a probiotic blend that includes Lactobacillus rhamnosus.
Your body uses magnesium for over 300 biological processes, but not all magnesium supplements are created equal. To get to where it’s needed—for example, to relax airway passages—magnesium taken orally must be in a bioavailable form. This product uses a highly absorbable chelated magnesium and malic acid.
This product contains four herbal ingredients that have anti-inflammatory properties: butterbur, feverfew, gingko, and ginger. This formula is designed to help prevent migraine headaches by balancing the body’s inflammatory responses.
Omega Pure EPA-DHA 2400:
A key part of an anti-inflammatory diet is fish because fish contains oils that our bodies need for optimal functioning. Some people don’t like eating fish, and nowadays it’s not always easy to find fish that are free of contaminants. This purified, potent fish oil supplement makes it easy to get these important fatty acids in the right amounts. Taking fish oil supplements is associated with a reduction in C-reactive protein and other markers of inflammation. 
Stress Essentials Licorice Complex:
Stress is one of those things that shrinks your allergy bucket—that is, it gives you less capacity to deal with the demands placed on your body. This formula contains adaptogens that help your body deal with stress, plus it contains licorice, which can help reduce asthma symptoms. (As with all supplements, be sure to check with your healthcare provider before taking this product because some people can experience unwanted
side effects from licorice.)
This formula combines four natural anti-inflammatories: turmeric, ginger, boswellia, and black pepper. All ingredients are rigorously tested for purity and standardized for high potency in this professional grade supplement.
With quercetin and methylsulfonylmethane (MSM), this product is designed to help prevent and relieve hay fever and other environmental allergy symptoms. Recent research suggests that taking MSM may reduce allergic rhinitis symptoms without the side effects of standard allergy medications.