Essential Oils for Asthma, Allergies and Breathing: Claims and Cautions
Strong scents can bother sensitive airways. What the sources say about essential oils, diffusers, asthma and allergic rhinitis, and why an asthma plan comes first.
Content last updated . This page has not been medically reviewed.
Safety first. Natural products can cause side effects and interact with medicines. Read essential oil safety before you use anything on this page.
Urgent. If someone has an asthma attack, follow their personal asthma action plan and call 911 if breathing gets worse or does not improve; the NHS advises calling emergency services if a person starts to feel worse at any time. [1] Any allergic reaction with difficulty breathing is a medical emergency. [2] If an essential oil has been swallowed, call Poison Help at 1-800-222-1222.
Triggers: smell can be one
The Asthma and Allergy Foundation of America (AAFA) says people with asthma have inflamed airways that are sensitive to things that may not bother other people, and that triggers vary from person to person. [4] Its list of airborne irritants includes strong fumes, vapors or odors such as perfumes and scented soaps. [4] Essential oils are not named on that page, but they are very concentrated oils that carry a plant's odor. [5] Whether a particular oil bothers a particular person is individual and cannot be predicted from the sources we read.What research shows
| Claim | What the source found | Strength of evidence | Who and what was studied |
|---|---|---|---|
| "Essential oils treat asthma" | A systematic review of 13 publications found anti-inflammatory effects in cells and animals only. [6] | Preclinical (cells or animals) | Laboratory experiments; no human outcomes. Not evidence of effect in people |
| Complementary approaches for asthma | Evidence does not support using them instead of proven medical management; approaches that help manage stress or anxiety might help people feel better and improve asthma control when added to usual care. [3] | Insufficient evidence for oils | NCCIH summary of complementary approaches generally, not oils specifically |
| Year-round (perennial) nasal allergy symptoms | In one trial, 54 adults with perennial allergic rhinitis inhaled a blend of sandalwood, geranium and Ravensara or almond oil (placebo) for 5 minutes twice daily for 7 days. The oil group had better nasal symptom scores, especially nasal obstruction. [7] | Promising but limited | One small trial, 7 days, a blend rather than a single oil; allergic rhinitis is not asthma |
| Eucalyptus, peppermint or other oils "open the airways" | Proper evidence not found for inhaled oils. We searched PubMed for trials and reviews of essential oils and asthma and found laboratory reviews and diffuser air studies, but no trial of inhaled oil on asthma symptoms. | Marketing claim | Not applicable |
| Eucalyptol (1,8-cineol, the main compound of eucalyptus oil) | In 32 people with steroid-dependent asthma, a capsule product let more people reduce oral steroid doses than placebo over 12 weeks. [8] | Promising but limited | A pharmaceutical-type capsule of one compound under trial supervision, not inhaled oil, not a household oil, and not a reason to swallow any oil |
Diffusers and the air in your home
Studies that measured diffuser air did not measure asthma. An ultrasonic diffuser chamber study found that lemon, lavender and eucalyptus oils released volatile compounds and particles, and modeling suggested reasonable use could add substantially to indoor particles. [9] A tea tree oil simulation in a US household found some terpene levels from a heat diffuser exceeded long-term exposure limits used in Europe. [10] These are exposure measurements, not proof of harm to a person, but they are a reason to be careful in small rooms or around sensitive people. See essential oil diffusers.What readers can do
Keep following your asthma plan and ask your clinician before adding a scent product, especially if you notice coughing, wheeze or chest tightness after exposure. For a cold or stuffy nose, see essential oils for colds, congestion and sinus and allergies vs colds. A fuller safety page is oils, diffusers and breathing problems.Frequently asked questions
Can essential oils help asthma?
No source we read shows that. NCCIH says evidence does not support using complementary approaches instead of proven medical management. [3] Laboratory work in cells and animals is preclinical. [6]
Can a diffuser trigger asthma?
Strong odors are listed among airborne irritants that can bother sensitive airways. [4] Diffusers release volatile compounds and particles into room air. [9] We did not find a trial of diffusers and asthma attacks.
Are essential oils good for allergies?
One small trial found a sandalwood, geranium and Ravensara blend improved nasal allergy symptom scores over almond oil in 54 adults for a week. [7] It is a single short trial and it was not about asthma.
What if an essential oil makes it hard to breathe?
Follow your asthma plan and get help. Treat any allergic reaction with difficulty breathing as a medical emergency. [2] Call 911 if breathing does not settle.
Are essential oils safe around babies and children with asthma?
Menthol should not be inhaled by or applied to the face of an infant or small child. [5] See oils around babies and children.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Specific cautions from the sources
- Allergy. Allergy to an essential oil is a very real possibility. [2]
- Cough and headache. Lavender aromatherapy is considered possibly safe, but it may cause headache or coughing. [11]
- Young children. Menthol, found in peppermint oil, should not be inhaled by or applied to the face of an infant or small child, because it may negatively affect breathing. [5]
- Vaporizer products. Poison Control says vaporizer products made for use with camphor are usually safe when used as directed, and that eucalyptus oil can cause seizures if swallowed. [2] See camphor oil dangers.
- Pets. Diffused oils affect animals in the room; see oils and pets.
- Medicines. Essential oils may interact with medications. [2]
References
- NHS (England), Asthma Read 2026-10-22.
- Poison Control (National Capital Poison Center), Essential oils: Poisonous when misused Read 2026-10-22.
- NCCIH, Asthma and Complementary Health Approaches: What You Need To Know Read 2026-10-22.
- Asthma and Allergy Foundation of America, What Triggers or Causes Asthma? Read 2026-10-22.
- NCCIH, Peppermint Oil Read 2026-10-22.
- Essential oils and its bioactive compounds modulating cytokines: a systematic review on anti-asthmatic and immunomodulatory properties, Phytomedicine 2020 Read 2026-10-22.
- Effect of inhalation of aromatherapy oil on patients with perennial allergic rhinitis: a randomized controlled trial, Evid Based Complement Alternat Med 2016 Read 2026-10-22.
- Anti-inflammatory activity of 1.8-cineol (eucalyptol) in bronchial asthma: a double-blind placebo-controlled trial, Respir Med 2003 Read 2026-10-22.
- Volatile organic compound and particulate matter emissions from an ultrasonic essential oil diffuser, Indoor Air 2021 Read 2026-10-22.
- Volatile organic compound and particle emissions from the use of tea tree oil in essential oil diffusers, J Occup Environ Hyg 2025 Read 2026-10-22.
- NCCIH, Lavender Read 2026-10-22.