A casualty will complain of _________ pain with an air embolism.

A casualty experiencing an air embolism will most commonly complain of chest pain. This type of pain arises due to the air bubbles entering the bloodstream, which can block blood vessels and lead to various symptoms, including those associated with respiratory and cardiovascular distress.

The air embolism can result in what is known as a "decompression sickness" when divers ascend too quickly. As air bubbles form in the veins and arteries, they can cause significant pressure changes, leading to sharp chest pain that may mimic a heart attack. Additionally, as the condition progresses, it can lead to more severe outcomes such as stroke or cardiac complications.

Understanding why chest pain is the key symptom helps emphasize the importance of recognizing air embolism signs early. Other types of pain, such as abdominal, leg, or back pain, may indicate different medical issues but are not the hallmark symptoms associated with air embolism.