Allergies Buggin’ Out? Cannabis Can Help, or Hurt

Published on May 3, 2019 · Last updated July 28, 2020
(CSA Images/iStock)

It’s allergy season again, and it’s no fun at all. If you’ve got seasonal allergies, it’s a familiar story. The weather is finally nice enough to be outside, but you can’t enjoy it because you’re spending the whole time sneezing and looking through blurry, watery eyes!

If the standard decongestants and nose sprays haven’t worked for you yet, don’t lose hope. You might be surprised to find help in an unlikely place—the cannabis plant!

“I certainly have some people say that it helps their allergies.”

That’s right—while cannabis can sometimes cause its own allergies, studies are showing that it can also help to curb the effects of allergic responses.

Learn the science and find out whether cannabis can help you defeat your seasonal allergies!

How Allergies Work

Allergies are the body’s way of protecting us from invaders, but allergic reactions often get triggered by harmless substances. When something like a piece of dust, mold, or pollen gets into your system, your body reacts, producing custom antibodies to attack the ‘invader’. These antibodies trigger chemicals like histamine which bring on our familiar allergy symptoms like sneezing, runny or stuffy nose, itching, watery eyes, ear congestion, inflammation, wheezing, coughing, or even asthma.

This is no small problem. An estimated 40% of the world’s population has allergic responses to foreign proteins in their environment, and 10-30% are affected by allergic rhinitis—the allergic response in the nose that gets triggered by inhaling allergens.

Can Cannabis Help Reduce Allergies?

It’s clear allergies can be rough. So can cannabis help?

Some experts say “yes.” Cannabis may be able to help when it comes to reducing allergies, and some cannabis consumers have already noticed the connection.

“I certainly have some people say that it helps their allergies.” explains Dr. Frank Lucido, a cannabis clinician from Berkeley, CA. As a doctor who regularly interacts with cannabis patients, Dr. Lucido says that he rarely see patients who suffer from cannabis-related allergies, but does have some clients who report using cannabis eases their allergic reactions.

Shop highly rated stores near you

Showing you stores near
See all stores

Still, other doctor’s say cannabis has potential but may not be all that effective in its current form.

Cannabis for Asthma Control?! See What Strains Leafly Reviewers Prefer

Dr. Peter Grinspoon, a primary care physician at Massachusetts General Hospital, instructor at Harvard Medical School and board member of the advocacy group Doctors For Cannabis Regulation, says that while he knows that some people use cannabis for allergies, he hasn’t come across that use in his patients.

Still he explains that, “some of the cannabinoids have a lot of anti inflammatory properties… so hypothetically, it could help.”

Whether you are dealing nasal inflammation, airway hyperreactivity, allergic asthma, or an immune overreaction, using anti inflammatory agents is usually helpful.

Still, Dr. Grinspoon cautions that just taking cannabis might not be as effective the standard over-the-counter allergy remedies.

“I don't think cannabis, as we’re taking it now, is nearly as strong as, for example, Flonase.”

“I don’t think cannabis, as we’re taking it now, is nearly as strong as, for example, Flonase.” He explains, adding, “I don’t think it’s a great treatment per se for allergies. That isn’t to say it doesn’t help people. If it helps people, that’s great.”

But cannabis for allergies is not something he’s recommending to his patients.

Dr. Grinspoon says he could envision a nasal spray in the future made from concentrated anti-inflammatory cannabinoids and terpenes. With something more targeted at the source of the allergies, he says he could see cannabis, “having the hypothetical potential for being a very effective treatment in the future.”

Still, for those who say cannabis helps them when their allergies get out of control, it can make a difference. It can be amazing to notice the quick reduction in all that sneezing and itching.

So what does the scientific research have to say? Unfortunately, we don’t have enough controlled human studies to say definitively whether cannabis can help with your allergies. But, there are quite a few studies that support the idea that cannabis can play helpful role in reducing allergies. Here are the facts:

Cannabis Vs. Histamine

One of the main ways that cannabis can help with allergies is through reducing the level of histamine released into your system. Histamine, which is triggered by antibodies, brings on a whole host of allergic responses. So preventing or reducing histamine release can make a big difference. One way cannabis can do this is through reducing the antibodies that trigger histamine.

For example, A 2009 study found that cannabinoids impaired activation of mouse T-cells (a type of white blood cell). Since T-cell activation increases antibody responses, it leads to increased histamine and thus, increased allergic reactions. By impairing this activation, cannabinoids are able to reduce the antibody response and help lesson your allergy symptoms.

And it’s not just cannabinoids that can help. Terpenes play a role as well. In a 2014 study, researchers found that alpha-pinene, a common terpene in cannabis, may also be able to help reduce antibody levels. Mice who were treated with the terpene showed decreased clinical symptoms of allergies, like rubbing their nose, eyes, and ears. But they also had significantly lower levels of nasal immunoglobulin E, an important antibody that triggers histamine release.

A cell study from 2005 suggests cannabis can also prevent increased histamine responses through a different route. This study found that exposure to THC could suppress mast cell activation. Mast cells are found in connective tissue and their activation triggers the release of histamine.

So suppressing mast cell activation could prevent or reduce the severity of your allergies.

Cannabis Vs. Inflammation

When allergies hit, inflammation plays a big role, so one way that cannabis may be able to help reduce allergy symptoms is through preventing or reducing inflammation.

“Cannabis seems to inhibit the inflammatory pathway.” explains Dr. Sue Sisley, a cannabis researcher currently conducting controlled human studies on cannabis’ effects. “And that certainly does relate to allergies because if you can cut the inflammatory pathway, then it could certainly help the untreated allergies, all the classic symptoms, the itchy, runny nose, itchiness, hives, all those kinds of things.”

Still, Dr. Sisley cautions that this is still theoretical. “It makes sense. It’s just that I can’t back it up with science,” she explains. “It’s like most things in cannabis research, we have a mountain of anecdotal reports, but very little objective controlled data to back it up.”

Can Cannabis Help With Inflammation for Athletes?

Her study, which is investigating cannabis’ use for veterans with PTSD, will also take a closer look at cytokines—a marker for inflammation.

“We’re treating the veterans with all different varieties. So there’s a high-THC, a high-CBD, there’s a 1:1 ratio of THC to CBD. So we’ll be able to see how smoking these different varieties of flower affect the levels of their cytokines,” Dr. Sisley explains. “We’ve never really measured that, so in this study were drawing all these cytokines, and measuring their concentration.”

While the study isn’t designed to look at allergies, the research on cytokines may shed light on cannabis effects on inflammation – and this route towards easing allergic responses.

THC Vs. Allergic Skin Reactions

THC may also be able to help when it comes to allergic skin reactions. In a study from 2007, scientists looked at whether THC-based drugs could help reduce allergic responses in the skin. Researchers applied synthetic THC to the skin of mice with severe skin allergies and found that the skin cells of the treated mice had less cytokines—a chemical responsible for signaling immune cells to come to an irritated area. Researchers say this means cannabis could be helpful for reducing allergic reactions in skin.

CBD and THC Open Up Airways

In addition to reducing the symptoms of your runny nose and itchy skin, cannabis can also help with more severe allergy symptoms like asthma. Both THC and CBD have been shown to be effective bronchodilators in animal models—meaning that they are able to open up constricted airways. You can even find THC inhalers designed to help frequent asthma sufferers. Still, asthma can be a dangerous condition and needs to be treated with care. Make sure to talk to a doctor before making any changes to your asthma treatment plan.

While research on cannabis for allergies is still in an early phase, there is some evidence to support the idea that cannabis can help with your allergies. Whether it’s reducing your congestion and itching, calming your skin, or opening up your airways – cannabis may help.

But don’t take our word for it! Try it out the next time you get those springtime sniffles. You might be surprised at how much better you feel.

Rising Cases of Cannabis Allergy

While cannabis can definitely help ease allergy symptoms, like many pollen-rich plants it’s also been known to cause it’s own allergic responses. And as legal cannabis use increases, reports of cannabis allergies have increased as well, with commonly reported symptoms like increased congestion, runny nose, watery eyes, post-nasal drip, and itchy eyes or nose. In more rare cases, other symptoms may arise as well. Some folks complain about migraines when they smell cannabis. Some report skin rashes from contact with cannabis resin. In more severe cases, cannabis allergies can worsen asthma or even cause anaphylactic shock.

In addition, some researchers have begun to notice a trend of cross-reactivity with allergies to cannabis or hemp and certain other plants such as tobacco, natural latex, plant-food-derived alcoholic beverages, and tomatoes. This means that those allergic to cannabis are more likely to also be allergic to these other plants-derived substances. Research is still unclear whether halting cannabis use can reduce allergic responses to these other plants.

While these allergic responses are more commonly reported amongst cannabis users, they may also affect those who are exposed passively to cannabis in their home environment (such as those who live with a cannabis smoker, or live near a cannabis grow site) or those who are exposed in occupational settings.

Until federal prohibition’s end makes research easier, allergy sufferers will have to do the research, and experiment for themselves.

How does cannabis affect your allergies? Let the Leafly community know in the comments below!

Shop highly rated stores near you

Showing you stores near
See all stores
Emily Earlenbaugh
Emily Earlenbaugh
Dr. Emily Earlenbaugh is a cannabis writer and educator. She is the Director of Education for Mindful Cannabis Consulting, where she teaches patients how to find the cannabis options that work best for them. She regularly writes about cannabis science and culture for publications like Cannabis Now Magazine, SF Chronicle’s GreenState, HelloMD, and Big Buds Magazine. Emily has a doctorate in philosophy of science from UC Davis.
View Emily Earlenbaugh's articles
Get good reads, local deals, and strain spotlights delivered right to your inbox.

By providing us with your email address, you agree to Leafly's Terms of Service and Privacy Policy.