Text / Zeng Weigen
(Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University)
Fever can be caused by many causes
In the eyes of the people, the most common cause of fever is colds, in fact, in addition to colds, many causes can lead to fever, the most common is bacteria, viruses and other microorganisms caused by infectious diseases, such as tonsil inflammation, pneumonia, enteritis, urethritis, cholecystitis and so on.
In addition to infectious diseases, many other diseases can also cause fever, such as tumors, trauma, after surgery, certain drugs, hyperthyroidism, allergies, central brain diseases, etc.
Fever is a protective mechanism
Our human brain has a thermoregulatory center, and the body's heat production and heat dissipation are basically balanced, so humans are thermostatic animals.
In addition to thermostatic animals, most of the animals on the earth are thermostatic animals, also known as cold-blooded animals, they have no body temperature regulation mechanism in their bodies, and they can only rely on their own behavior to regulate the dissipation of heat or absorb heat from the external environment to increase their body temperature. The body temperature of cold-blooded animals changes with changes in ambient temperature, and fish, frogs, snakes, lizards, crocodiles, turtles, crustaceans, etc. are all cold-blooded animals.
For thermostatic animals like us humans, when the body is dysfunctional under the action of pyrogens or the body temperature center, it will lead to an increase in thermogenesis, and the heat dissipation cannot be increased accordingly, which in turn makes the body temperature rise beyond the normal range, which is fever.
When the fever is warm, the body temperature rises, and the reproductive activity of toxic and harmful microorganisms decreases. Our immune system is more reactive, the number of immune cells increases, and the bactericidal activity is enhanced. A certain degree of fever can effectively fight off pathogenic microorganisms and kill them.
Therefore, fever is a protective mechanism that helps us to remove toxic and harmful substances, if the body temperature does not exceed 38.5 ° C, doctors generally do not recommend the use of fever reducers. However, long-term high fever is also harmful to the body, especially the damage to the brain is very large, which can cause high fever convulsions, shock, and even death, which need to be dealt with in time.
Long-term no fever is going on
Long-term no fever can reflect good physical fitness to a certain extent, or usually pay great attention to maintenance, away from bacteria and viruses, so that they have no opportunity. Or, before bacteria and viruses enter the blood circulation, they are killed by immune cells, have no chance to cause fever in the body, and are eliminated locally.
However, fever is only one aspect, and cannot fully reflect the physical health, because many diseases do not cause fever, such as cardiovascular and cerebrovascular diseases, coronary heart disease, diabetes, most tumors, etc. Long-term fever does not mean that you will not get these diseases.
Long-term fever prone to cancer?
There is no scientific basis for this claim. Cancer is because various carcinogenic factors act on the human body, causing genetic mutations in cells that eventually become cancerous and have no connection with fever. Fever is mainly caused by bacteria, viruses and other pyrogens causing the thermoregulation point to move up, causing an increase in body temperature.
The reason why many people have such an illusion may be this: many people do not have fever for a long time, think that they or others think that his body is very good, thus ignoring their own physical abnormalities, not participating in the physical examination on time, not finding precancerous lesions in time, and intervening in time. When diagnosed with cancer, many people can't accept such a reality, why do they suddenly get cancer when they are usually in such good health? Is it related to the long-term absence of fever? In fact, this is just an illusion.
All in all, it is good to have no fever and no cold for a long time, which shows that the body is good from one aspect. But also can not be careless, fever and cancer is not necessarily related, we still have to pay attention to maintain healthy living habits, regular physical examination.
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