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  1. WebMD is a trusted source of health and medical information, with expert reviews, community support, and educational services. Find a doctor near you or browse health news.

    • Pathophysiology
    • Significance
    • Signs and symptoms
    • Overview
    • Prognosis

    A blood pressure reading appears as two numbers. The first and higher of the two is a measure of systolic pressure, or the pressure in the arteries when the heart beats and fills them with blood. The second number measures diastolic pressure, or the pressure in the arteries when the heart rests between beats.

    Optimal blood pressure is less than 120/80 (systolic/diastolic). In healthy people, low blood pressure without any symptoms is not usually a concern and does not need to be treated. But low blood pressure can be a sign of an underlying problem -- especially in the elderly -- where it may cause inadequate blood flow to the heart, brain, and other vi...

    Chronic low blood pressure with no symptoms is almost never serious. But health problems can occur when blood pressure drops suddenly and the brain is deprived of an adequate blood supply. This can lead to dizziness or lightheadedness. Sudden drops in blood pressure most commonly occur in someone who's rising from a lying down or sitting position t...

    Postural hypotension is considered a failure of the cardiovascular system or nervous system to react appropriately to sudden changes. Normally, when you stand up, some blood pools in your lower extremities. Uncorrected, this would cause your blood pressure to fall. But your body normally compensates by sending messages to your heart to beat faster ...

    The risk of both low and high blood pressure normally increases with age due in part to normal changes during aging. In addition, blood flow to the heart muscle and the brain declines with age, often as a result of plaque buildup in blood vessels. An estimated 10% to 20% of people over age 65 have postural hypotension.

  2. 2023年3月3日 · Normal: Lower than 80. Stage I: hypertension: 80-89. Stage II: hypertension: 90 or more. Hypertensive crisis: 120 or more. Call 911. Our chart below has more details. Even if your diastolic number ...

  3. 2024年5月19日 · Here's a closer look at some of them: Magnesium side effects. Magnesium supplements can cause nausea, cramps, and diarrhea. Magnesium supplements often cause softening of stool. Magnesium ...

  4. 2023年7月3日 · Ankylosing spondylitis (AS) is a rare type of arthritis that causes pain and stiffness in your spine. This lifelong condition, also known as Bechterew disease, usually starts in your lower back....

  5. 2023年10月24日 · Hyperventilation. If you become intensely anxious or panicked and breathe too quickly, you may feel faint from hyperventilation (taking in too much oxygen and getting rid of too much carbon ...

  6. 2023年4月21日 · Written by Matthew Hoffman, MD. Causes. Symptoms. Diagnosis. Types. 4 min read. A pleural effusion is an unusual amount of fluid around the lung. Many medical conditions can lead to it, so even...

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