A pregnant woman at 23 weeks gestation has fainted twice. Which warning signs should she be aware of to prevent injury?

Sweating is a significant warning sign for a pregnant woman who has experienced fainting. It often indicates that the body is experiencing excess stress or a sudden drop in blood pressure, which can lead to fainting episodes. Increased sweating can be a precursor to fainting, and being aware of this symptom can help the woman take preventive actions, such as sitting or lying down to avoid further injury.

The other options, while they may indicate discomfort or distress, are not as directly linked to the risk of fainting. Nausea can occur for various reasons and may not directly precede a fainting episode. Chills are often associated with illness or infection and may not relate to fainting. Yawning is typically a sign of tiredness and does not significantly contribute to the awareness of fainting risk. Understanding the body's signals, such as excessive sweating, can empower the woman to seek help or take preventative measures in situations where her health might be at stake.