Final answer:
Orthostatic hypotension can be caused by low blood volume or autonomic failure, and it is important to address underlying conditions for improvement.
Step-by-step explanation:
Orthostatic hypotension, or a sudden drop in blood pressure when standing up, can have several likely causes. One common cause is low blood volume, which can result from dehydration or medications that affect fluid balance. Another cause is autonomic failure, which can be seen in disorders such as diabetes or multiple system atrophy. It is important to address these underlying conditions to improve hypotension.