How do you treat severe bleeding during first aid?

1. Apply pressure to the bleeding wound. Use a clean cloth, bandage, or piece of clothing to apply pressure directly to the wound. Try to apply pressure with both hands, and do not remove the pressure once applied.

2. Elevate the injured limb. If possible, raise the injured limb above the level of the heart. This will help to reduce blood flow to the wound.

3. Apply a tourniquet. If pressure is not enough to stop the bleeding or the bleeding is severe, a tourniquet must be used. To make a tourniquet, tie a piece of cloth or rope above the wound, as close to the body as possible. Tighten the tourniquet until the bleeding stops, and then secure it in place. Be careful not to make the tourniquet too tight, as this could damage the nerves or blood vessels in the limb.

4. Seek medical attention. Once the bleeding has been controlled, it is important to seek medical attention as soon as possible. Severe bleeding can cause complications such as shock and infection, and it is important to receive medical attention to prevent these complications from occurring.