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Hypotension is low blood pressure, especially in the arteries of the systemic circulation.〔(TheFreeDictionary > hypotension ). Citing: The American Heritage Science Dictionary Copyright 2005〕 Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps out blood. Hypotension is generally considered if systolic blood pressure less than 90 millimeters of mercury (mm Hg) or diastolic less than 60 mm Hg. However, in practice, blood pressure is considered too low only if noticeable symptoms are present. Hypotension is the opposite of hypertension, which is high blood pressure. It is best understood as a physiological state, rather than a disease. It is often associated with shock, though not necessarily indicative of it. For some people who exercise and are in top physical condition, low blood pressure is a sign of good health and fitness.〔(【引用サイトリンク】 Low blood pressure (hypotension) )〕 For many people, excessively low blood pressure can cause dizziness and fainting or indicate serious heart, endocrine or neurological disorders. Severely low blood pressure can deprive the brain and other vital organs of oxygen and nutrients, leading to a life-threatening condition called shock. ==Signs and symptoms== The cardinal symptoms of hypotension include lightheadedness or dizziness. If the blood pressure is sufficiently low, fainting and often seizures occur. Low blood pressure is sometimes associated with certain symptoms, many of which are related to causes rather than effects of hypotension: * chest pain * shortness of breath * irregular heartbeat * fever higher than 38.3 °C (101 °F) * headache * stiff neck * severe upper back pain * cough with sputum *Prolonged diarrhea or vomiting * dyspepsia (indigestion) * dysuria (painful urination) * adverse effect of medications * acute, life-threatening allergic reaction * seizures * loss of consciousness * profound fatigue * temporary blurring or loss of vision * connective tissue disorder Ehlers-Danlos Syndrome * Black tarry stools 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hypotension」の詳細全文を読む スポンサード リンク
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