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Orthostatic intolerance
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== Types of orthostatic intolerance == === Postural orthostatic tachycardia syndrome === {{Main article|page_name=Postural orthostatic tachychardia}} [[Postural orthostatic tachycardia syndrome]] (POTS) is one of a group of disorders that have orthostatic intolerance (OI) as their primary symptom. The primary symptom of OI is lightheadedness or fainting. In POTS, the lightheadedness or fainting is also accompanied by a rapid increase in heartbeat of more than 30 beats per minute, or a heart rate that exceeds 120 beats per minute, within 10 minutes of rising.<ref>{{Cite web|url=https://www.ninds.nih.gov/Disorders/All-Disorders/Postural-Tachycardia-Syndrome-Information-Page| title = Postural Tachycardia Syndrome Information Page | website = [[National Institute of Neurological Disorders and Stroke]]|access-date=2018-08-27}}</ref> === Orthostatic hypotension === {{Main article|page_name=Orthostatic hypotension}} [[Orthostatic hypotension]], also called postural hypotension, it is a form of sudden low blood pressure that occurs upon standing. It can often cause dizziness. it is defined as a fall in systolic blood pressure of at least 20 mm Hg or diastolic blood pressure of at least 10 mm Hg when a person assumes a standing position.<ref>{{Cite news | url=http://www.potsuk.org/living_with_low_blood_pressure| title = PoTS - Living with low blood pressure | last = | first = |work=PoTS UK|access-date=2018-08-27|language=en}}</ref> === Neurally mediated hypotension === {{Main article|page_name=Neurally mediated hypotension}} [[Neurally mediated hypotension]] (NMH), also called neurally mediate syncope, peripheral vasodilation causes blood to pool in the extremities. It is associated with a decrease in blood pressure, and a slow or lowered heart rate upon standing.<ref>{{Cite web|url=http://www.dysautonomiainternational.org/page.php?ID=31 | website = Dysautonomia International| title = Summary of Syncope and Neurally Mediated Syncope|language=en|access-date=2018-08-27}}</ref> === Vasovagal syncope === {{Main article|Syncope}} Syncope means fainting, and near-syncope is when a person almost faints.{{citation needed | date = 2022}}
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