Essential oils are generally safe for use if you have cancer, but they can pose side effects.
“For example, young children can develop breathing problems with aromatherapy with some essential oils,” Kiefer says. “Aromatherapy can make some people’s breathing worse, such as if you have asthma.”
Other possible side effects include:
- A skin reaction or allergic reaction
- Increased sun sensitivity (if applied before going in the sun)
- An unpleasant smell
According to Reis, before beginning essential oil therapy, you should consult with your oncology team, who may refer you to a certified aromatherapist in a clinical setting.
Ideally, this should be someone with experience supporting people with cancer. Reis also emphasizes that your oncology team and aromatherapist will take into account the possible side effects of aromatherapy, since cancer treatments may make your skin more sensitive, and essential oils can sometimes interact with medications.
Check with your healthcare provider before using any essential oil, especially if you’re pregnant, breastfeeding, or have another health issue, such as asthma, kidney disease, or liver problems.
Essential oils are not a one-size-fits-all therapy, and several factors need to be considered before use, Reis says. Age, pregnancy or breastfeeding, body weight, skin health, and overall health all play a role in determining which oils are appropriate and how they should be diluted.
Certain oils, such as peppermint, should not be used for children under 30 months due to their high menthol content, which can increase the risk of seizures.
People with estrogen-dependent cancers should also avoid oils with phytoestrogen-like activity, such as aniseed, clary sage, bitter fennel, myrtle, and star anise, as they may interfere with treatment or mimic estrogen in the body, Reis says. These risks highlight why essential oils must be chosen carefully for individuals with certain health conditions.
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