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2022年12月24日 · But the reality is that a "normal" body temperature can fall within a wide range, from 97 F to 99 F. It’s usually lower in the morning and goes up during the day. It peaks in the late afternoon ...
They tend to include sore throat, runny nose, and other symptoms similar to a cold. They may not include lower respiratory tract symptoms such as wheezing, severe cough, or fever. COVID-19 ...
- 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.
2024年3月26日 · Magnetic resonance imaging (MRI) is a test that uses powerful magnets, radio waves, and a computer to make detailed pictures of the inside of your body. MRIs can diagnose a lot of health issues ...
2022年9月4日 · Learn how low potassium (hypokalemia) affects your body, what causes it, how to diagnose it, and how to treat it with WebMD's expert guide.
2023年6月30日 · The fast beating and other symptoms last longer than a few minutes. The symptoms occur often. If it happens too often and for too long, your heart muscle can weaken. Make sure you see a doctor ...
