With certain medical conditions you will find some essential oil contraindications, or conditions under which one should not be using essential oils. Just because an essential oil is touted as "pure" and "safe", doesn't mean that you can use it freely, especially if you have certain medical conditions. Below is a list of known medical conditions which don't respond well, or can create problems, when you use essential oils.

Essential Oil Contraindications

Medical or Health Condition

Essential Oils to Avoid

Alcoholism

Star Anise, Bay Rum, Valerian Root

Allergies - Ragweed

Any Chamomile

Allergies - Cinnamon or Peru Balsam

Cinnamon

Asthma

Camphor, Nutmeg, Fir, Wintergreen

Cancer

*consult with physician and/or aromatherapist -- Basil, Fennel, Nutmeg, Myrtle and Star Anise

Cancer - estrogen-dependent

Anise

Children

Peppermint

Endometriosis

Anise

Epilepsy or Seizure disorder

Basil, Birch, Camphor, Eucalyptus, Fennel, Galbanum, Hyssop, Sage, Rosemary, Yarrow, Idaho Tansy, Wormwood

GERD, gastric ulcers

Peppermint, Wintergreen

Glaucoma

Lemongrass, Melissa, Benzoin, Bitter Orange, May Chang

Heart issues

*consult with physician and/or aromatherapist / Nutmeg, Bitter Orange, Fir

Hemophilia

Bay Rum

Hyperglycemia/Diabetes

Angelica root

Hypertension/High Blood Pressure

Cedarwood, Red Thyme, Hyssop, Pine, Rosemary, Sage, Bitter Orange

Hypoglycemia/Low Blood Sugar

Geranium, Bergamot

Hypotension

Melissa, Lemon, Garlic, Bergamot

Hypothyroidism

Fennel, Melissa

Kidney Issues

Juniper berry, Black pepper, Bay Rum

Pregnancy

*consult with physician and/or aromatherapist

Prostatic hyperplasia

Lemongrass, Eucalyptus, Melissa, Benzoin

Psychiatric conditions

Nutmeg, Sweet Basil