Wed Oct 14, 2026 | 02:30 PM IST

Medically Reviewed by Dr Blossom Kochhar , Pioneer of Aromatherapy & Chairperson, Blossom Kochhar, Group of Companies

7 Essential Oil Side Effects You Should Know About

Essential oils are extremely useful, but only when used with caution. If you are new to essential oils or if you have recently started using them, here are some side effects that you must keep in mind to prevent any mishap.
7 Essential Oil Side Effects You Should Know About7 Essential Oil Side Effects You Should Know About

Essential oils are everywhere these days. You’ll find them in everything from skincare to diffusers, massage blends, even cleaning products. Sure, they smell amazing, but it is more than that. These are powerful plant extracts that offer incredible benefits, but their downsides shouldn’t be ignored either.

Just because something is natural doesn’t mean it is harmless. Essential oils can cause problems, especially if you use them around kids, pets, or anyone with health issues.
Here are seven side effects to watch for, as shared by Dr Blossom Kochhar, Pioneer in Aromatherapy, Skincare Expert and Chairperson of Blossom Kochhar Group of Companies.

1. Skin Irritation

Skin irritation tops the list. If you use essential oils directly on your skin, especially without diluting them, you might experience redness, itchiness, a burning sensation, dryness, or discomfort.

Expert Tip: These oils pack a punch, so always mix them with a carrier oil or use products already formulated for skin. The amount you need depends on the oil, where you’re applying it, and your skin.

2. Allergic Reactions

According to a study published in the Journal of Ethnopharmacology, some people are allergic to certain oils or the chemicals in them. That might show up as itchy skin, redness, swelling, a rash, or a burning feeling.

If you’re trying something new, go slow. Dilute it first, test on a small area, and see what happens. Get a bad reaction? Stop using it and talk to your doctor.

3. Increased Sunlight Sensitivity

Certain oils, especially citrus, make your skin more sensitive to sunlight. This is called photosensitivity. It can lead to redness, irritation, or even dark spots if you go out in the sun.

Always check if your oil can cause this. If you use a photosensitizing oil, use sunscreen or cover up, and try to stay out of direct sunlight after applying.

Also Read: Essential Oils Guide: Benefits, Risks, and How to Use Them Safely

4. Eye And Mucous Membrane Irritation

Never put essential oils in your eyes, inside your nose, or on other sensitive spots. Even a drop can sting like crazy.

Get oil in your eye by accident? Don’t rub. Rinse gently with water and, if it still hurts or your vision’s blurry, get medical help.

5. Headaches Or Nausea

Smells affect people differently. One person finds lavender soothing, but another might get a headache, feel sick, or get dizzy after smelling oils, especially if the scent is strong or lingers.

This happens more in small rooms or if you overdo it with a diffuser. Use just a bit, keep air moving, and stop if you start to feel off. This is one of the common mistakes that people make when using an essential oil.

6. Breathing Issues

Strong scents can bother sensitive people. Essential oils can make some people cough, irritate their throats, or even trigger chest tightness or trouble breathing.

If that happens, head outside and skip the oil.

Anyone with asthma or breathing trouble should be extra careful when using essential oils, suggests the American Lung Association.
If you are not sure if these oils are safe for you, ask your doctor before starting use.

Also Read: Can Essential Oils Boost Your Mood? The Truth Behind Aromatherapy's Mental Benefits

7. Problems From Swallowing Or Using Oils The Wrong Way

Essential oils are powerful and swallowing them can be dangerous, even if they’re natural. Some are outright toxic if taken by mouth.

Keep bottles locked away from children and pets. Don’t take any oil internally unless a professional gives you the green light and the oil’s actually made for that.

Natural Doesn’t Mean Risk-Free

Essential oils can absolutely upgrade your self-care routine, with a little caution. Just remember: these are potent substances, not just nice-smelling liquids.

Always follow the directions for the oil you’re using. Dilute before you put it on your skin. Keep them well away from your eyes, and don’t assume more is better.

Everyone’s body is different. Your age, skin, allergies, medications, health conditions, or even whether you’re pregnant or breastfeeding can change how safe an essential oil is for you.

If you’re pregnant, nursing, have health issues, take regular medicines, or plan to use oils around kids, talk to a healthcare pro first.

Final Word

Safe aromatherapy isn’t about the strongest scent or using the biggest dose. It’s about picking the right oil, using it wisely, and really tuning in to how your body feels. Essential oils are beneficial but must be used wisely. Do not follow something because everyone else is doing so; speak to an expert before using anything on your skin.

FAQ

  • What essential oils should you not use?

    Certain essential oils that are considered high-risk are camphor, wintergreen, oregano, and pennyroyal.
  • What are the symptoms of essential oil toxicity?

    Breathing issues, nausea, vomiting, irritated throat, dizziness, wheezing, etc. are some of the common signs of essential oil toxicity.

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Chanchal Sengar

Chief Sub Editor

Chanchal Sengar is a senior health journalist with nine years of experience in journalism, including seven years dedicated to health reporting. She currently serves as Chief Sub Editor at OnlyMyHealth, where she writes and edits content on women's health, heart health, cancer awareness, nutrition, and pregnancy. With thousands of published articles, Chanchal focuses on explaining health issues in a clear and responsible way. Her reporting draws on medical studies, government health data, and expert commentary. Articles that require medical verification are reviewed by qualified healthcare professionals before publication. Chanchal Sengar has a vast network of doctors and medical experts that continuously work with her to authenticate the articles she writes. Before joining Jagran New Media, she worked with First India News in Rajasthan, where she gained experience in news reporting and public interest journalism.

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  • Current Version

    Aug 27, 2026 22:26 IST

    Published By : Chanchal Sengar
    Reviewed By : Dr Blossom Kochhar