What condition can cause hypovolemia leading to orthostatic hypotension?

Hypovolemia occurs when there is a significant decrease in the volume of blood circulating within the body. This reduction in blood volume can lead to decreased perfusion of organs and tissues, which may result in symptoms like orthostatic hypotension. Orthostatic hypotension is characterized by a significant drop in blood pressure when a person stands up quickly, often causing dizziness or fainting.

Excessive vomiting can indeed cause hypovolemia. When a person vomits excessively, they lose a substantial amount of fluid and electrolytes. This loss reduces the overall blood volume, leading to a decreased venous return to the heart, which in turn can result in lower cardiac output and inadequate blood pressure control, especially when changing positions.

While severe allergic reactions and sepsis can also lead to a form of hypovolemia due to fluid shifts or vasodilation, they primarily involve other pathophysiological mechanisms. Severe allergic reactions can lead to anaphylactic shock, which is characterized by widespread vasodilation and increased vascular permeability. This can cause fluid to leak from the vascular system, leading to hypovolemic shock, but it is not a direct consequence of loss of volume as with vomiting. Sepsis can also cause distributive shock and