What action should the casualty take during a nosebleed?

During a nosebleed, the most effective action for the casualty is to pinch the soft part of their nose. This method helps constrict the blood vessels and reduces blood flow, making it easier for the bleeding to stop. Keeping the head slightly forward while applying pressure to the nose can help prevent blood from flowing down the throat, which can lead to choking or nausea.

In this context, swallowing blood can be harmful as it can irritate the stomach and cause discomfort. Lying down is not recommended since it can promote blood flow towards the head and aggravate the bleeding. Speaking to calm down may distract the person but does not provide any direct benefit in managing the nosebleed itself. Focusing on pinching the nose is the most practical and effective approach to controlling the situation.