Where should a tourniquet be placed on the thigh for severe bleeding in the lower limb?

　　In general, when managing severe bleeding in the lower limbs, a tourniquet should be applied as close to the heart as possible on the injured limb—specifically, at the upper thigh, just above the groin. The detailed explanation is as follows:

　　When severe bleeding occurs in the lower limb, quickly assess the extent of bleeding. If the bleeding is substantial, emergency hemostatic measures may be required. Before applying a tourniquet, attempt direct pressure on the wound first. Use a clean hand or gauze to firmly press directly on the bleeding site to control hemorrhage as quickly as possible, until the tourniquet is ready for use. It is important to place the tourniquet as close to the heart as possible on the injured limb—that is, at the base of the thigh, just above the inguinal region—as this can effectively help stop bleeding and alleviate symptoms.

　　It should be noted that tourniquets should only be used in emergencies, and medical professionals must be contacted immediately after application. Incorrect use or prolonged application of a tourniquet may lead to serious tissue damage or necrosis. Therefore, extreme caution must be exercised when using a tourniquet, and it should ideally be applied under the guidance of trained personnel to ensure the patient's safety.