Essential oils do not have much effect on high blood pressure, the main role of essential oils is to apply when massage, have a moisturizing effect on the skin, relieve fatigue and so on. The side effects of essential oils are mainly for the skin, and may cause allergies and other situations, once the allergic reaction caused by essential oils will appear a transient extreme increase in blood pressure, headache and other uncomfortable feelings. However, in more serious cases, anaphylactic shock can occur, when blood pressure drops and pulse counts can be shock-like. People who are allergic to essential oils must be careful when applying them, and it is forbidden to apply them for massage therapy.