Final answer:
If a client has a fever and nausea, it is important to prioritize their health and well-being by cancelling the massage appointment until they have recovered.
Step-by-step explanation:
If a client has a fever and nausea, it is important to prioritize their health and well-being. In this situation, cancelling the massage appointment until they have recovered would be the most appropriate course of action. Fevers and nausea are common symptoms of illness, and massage therapy may not be advisable or beneficial for the client when they are feeling unwell. It is recommended to follow the general expectations, such as staying home, resting, and seeking medical attention if the symptoms persist.