Which of the following is NOT a cause of hypovolemic shock?

Hypovolemic shock occurs when there is a significant reduction in blood volume, which leads to inadequate perfusion of organs and tissues. Causes of this condition are typically related to a loss of blood or body fluids.

Dehydration can lead to a decrease in blood volume as fluids are lost from the body, affecting the overall circulatory system and potentially leading to hypovolemic shock. Similarly, severe bleeding, whether from trauma or other medical conditions, directly reduces blood volume and can quickly result in shock. Fluid loss from burns also contributes to hypovolemic shock, as extensive burns can cause significant fluid loss through damaged skin.

Tumors, while they can cause a variety of health issues, do not directly contribute to the loss of blood volume in the same manner as the other options listed. Tumors may cause complications or obstruct blood vessels but are not inherently responsible for hypovolemic shock due to a direct loss of fluid or blood. Thus, identifying tumors as the only option that does not directly lead to hypovolemic shock highlights their distinct nature compared to the other causes, which are all forms of fluid or blood loss.