The best way to treat hypotension is to seek out the cause. Dehydration is a common cause of hypotension, and is usually first on the list during diagnosis.

Dehydration is a situation which occurs when the body counters a water deficiency. A fall in the fluid level causes the amount of blood in the body to decrease as well resulting in hypotension. Dehydration can occur due to many reasons. Some of the common causes are excessive sweating vomiting and diarrhea. Usage of pills such as diuretics, which increase fluid excretion from the body, can also cause the water level to fall. Heat exhaustion and heat strokes can also cause dehydration.

The symptoms of hypotension due to dehydration are easy to recognize. The patient undergoes dizziness and lightheadedness even in cases of mild dehydration. More serious symptoms are fatigue and fainting. A life-threatening situation can occur when severe dehydration happens. This causes the volume of blood in the body to fall rapidly, preventing the body's vital organs from receiving adequate oxygen. This condition can also lead to the patient experiencing hypovolemic shock.

Since hypotension affects the normal functionality of the human body, it is important to ensure sufficient fluid intake everyday to provide the sufficient amount of water needed by the body to function properly – the optimum being eight glasses a day.