Orthostatic hypotension UMLS:C0020651 Decrease in blood pressure upon standing up SNOMEDCT_US:28651003 A form of hypotension characterized by a sudden fall in blood pressure that occurs when a person assumes a standing position. human_phenotype MSH:D007024 HP:0004932 Postural hypotension HP:0001278 体位性低血压病 HP:0006700 Abnormal autonomic nervous system physiology Abnormal systemic blood pressure