Final answer:
The common cause of NaCl loss that leads to hypotension includes conditions like excessive sweating, vomiting, diarrhea, use of diuretics, and adrenocortical insufficiency. These conditions can result in hyponatremia and dehydration, which contribute to low blood pressure.
Step-by-step explanation:
The most common cause of sodium chloride (NaCl) loss and hypotension is due to conditions that lead to an abnormal loss of sodium from the body, such as excessive sweating, vomiting, or diarrhea. The use of diuretics and the presence of certain diseases, such as adrenocortical insufficiency, can also lead to NaCl loss. Hyponatremia, which is a lower-than-normal concentration of sodium in the blood, can result from these conditions and further contribute to hypotension. Orthostatic hypotension, specifically, can occur when blood volume is low due to dehydration or the use of medications such as diuretics or vasodilators that affect fluid balance.