为什么发烧时感觉冷？中医西医有话说

来源: 26484915 于 2014-06-17 09:38:15 [档案] [博客] [旧帖] [给我悄悄话] 本文已被阅读：次 (3344 bytes)

中医说：

东汉伟大的医学家张仲景在他的著作《伤寒论》中说：“身大热，反欲得衣者，寒在骨髓。”

就是说发烧的人虽然体温很高，身上反而感觉寒冷想多穿衣服，表明体内寒气很重，寒邪都到骨髓了。

此时再用抗生素等寒凉药物输液消炎退烧，会把外在的一些寒湿之气直接带进体内。

西医说：

Getting chills when you're ill.

Flu activity is starting to pick up around the country. That prompted a listener in Walnut Creek, California to ask why fevers give you the chills.

We consulted Dr. Matthew Kluger of the Medical College of Georgia. He says when you have an infection, it resets your internal thermostat above the normal 98.6 degrees Fahrenheit.

Kluger:

The set point rises to maybe 101, or 102, or 103. And then you feel cold. And you shiver and raise your body temperature to that elevated level.

When the fever breaks, the thermostat gets set back to 98.6. That's when you start to sweat, throw off the covers, and hopefully begin to feel better.

Call us at 1-800-WHY-ISIT with your science question. If we use it, you'll get a free Science Update mug. I'm Bob Hirshon for AAAS, the Science Society.

Making Sense of the Research

With so many medicines and treatments available for all of our pains, illnesses, and discomforts, it's easy to forget that our own bodies have remarkable built-in defenses against disease.

Fever appears to be one of those defenses, although its purpose still isn't fully understood. One benefit of raising your body temperature is that it seems to boost the activity of your immune system. Raising your temperature by a few degrees may also kill some bacteria or viruses that are sensitive to slight temperature changes.

When your body raises its temperature set point, it's really prompting you to do things that raise your body temperature, like wear warm clothes, climb under the blankets, or drink hot liquids. In other words, it's raising your temperature (at least partly) in a roundabout way. By making 98.6 (inside you) feel chilly instead of comfortable, it's pushing you to behave in ways that raise your temperature up a little higher.

Of course, the problem with fever is that it doesn't take much to overheat the human body. That's why many doctors still recommend lowering fever. Drugs like aspirin, acetaminophen, and ibuprofen do this by blocking the production of fever-inducing chemicals called prostaglandins in the brain. They won't help you beat the bug that's making you sick, but they will prevent you from running a dangerously high temperature.

Now try and answer these questions:

Why do you get chills when you get a fever?
How do the chills work indirectly to raise your body temperature?
What would happen if your body's set point lowered to 96 degrees Fahrenheit? How would that affect your behavior?
Lizards, which do not internally regulate their body temperature, have been known to crawl under a heat lamp when they get infections. Why do you think that is?