Jisho

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りつせいていけつあつ 起立性低血圧
Noun
1. orthostatic hypotension; dizziness experienced when standing up
Wikipedia definition
2. Orthostatic hypotensionOrthostatic hypotension, also known as postural hypotension,, and colloquially as head rush or dizzy spell, is a form of hypotension in which a person's blood pressure suddenly falls when standing up or stretching. The symptom is caused by blood pooling in the lower extremities upon a change in body position. It is quite common and can occur briefly in anyone, although it is particularly prevalent among the elderly, and those with low blood pressure.
Read “Orthostatic hypotension” on English Wikipedia
Read “起立性低血圧” on Japanese Wikipedia
Read “Orthostatic hypotension” on DBpedia

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