Final answer:
Essential oils for aromatherapy may be contraindicated for clients with respiratory disorders, skin allergies, hypertension, and diabetes.
Step-by-step explanation:
In aromatherapy, essential oils are used for their therapeutic effects. However, there are certain clients for whom this therapy might be contraindicated. One of the contraindications is for clients with respiratory disorders such as asthma, as the strong aromas of essential oils may trigger an asthma attack or worsen respiratory symptoms. Another contraindication is for clients with skin allergies, as essential oils can cause allergic reactions when applied topically. The use of essential oils may also be contraindicated for clients with hypertension or high blood pressure, as some oils can stimulate the cardiovascular system and potentially increase blood pressure.