Hemorrhage due to trauma: This is the most common cause of hemorrhagic shock, particularly in young adults, and is often due to injuries such as lacerations, penetrating wounds, or blunt trauma that result in significant blood loss.

Postpartum hemorrhage: A leading cause of maternal morbidity and mortality worldwide, postpartum hemorrhage can occur due to uterine atony, retained placental tissue, or lacerations, leading to significant blood loss.
Gastrointestinal bleeding: Bleeding from the gastrointestinal tract, such as from ulcers, varices, or diverticula, can lead to hemorrhagic shock if not promptly recognized and treated.
Surgical bleeding: Complications from surgical procedures, including intraoperative or postoperative bleeding, can result in hemorrhagic shock.

Ectopic pregnancy: Although less common, a ruptured ectopic pregnancy can cause sudden, severe blood loss leading to hemorrhagic shock, and missing this diagnosis can be fatal.
Aortic aneurysm rupture: The rupture of an abdominal or thoracic aortic aneurysm can lead to rapid blood loss and hemorrhagic shock, requiring immediate intervention.
Coagulopathy: Conditions affecting blood clotting, such as hemophilia or disseminated intravascular coagulation (DIC), can increase the risk of hemorrhagic shock due to uncontrolled bleeding.

Hemophilia: A genetic disorder that impairs the body's ability to make blood clots, a factor that can contribute to hemorrhagic shock in the event of injury or spontaneous bleeding.
Vascular malformations: Rare conditions like arteriovenous malformations (AVMs) can cause significant, uncontrolled bleeding leading to hemorrhagic shock.
Tumor bleeding: Certain tumors, especially those in the gastrointestinal tract or uterus, can bleed and lead to hemorrhagic shock, although this is less common.