What causes high body temperature?

In daily life, high body temperature is a relatively common physical disease. Fever can easily lead to general weakness, dizziness, and affect normal life. There are many reasons for high body temperature. Generally, it may be caused by infection or inflammation in the body. Tumors in the body can also easily cause high body temperature.

Causes of high body temperature

① Aseptic necrotic tissue absorption, including physical, chemical factors or mechanical damage, such as large-area burns, internal bleeding and trauma or tissue damage after major surgery; tissue necrosis or cell destruction, such as malignant tumors, leukemia, acute hemolytic reactions, etc.

② Allergic reactions such as rheumatic fever, serum sickness, drug fever, connective tissue diseases and certain malignant tumors.

③ Endocrine and metabolic diseases, such as increased heat production in hyperthyroidism and reduced heat dissipation in severely dehydrated patients, which causes increased body temperature.

④Heart failure or certain skin diseases. In chronic heart failure, body temperature rises due to reduced cardiac output, decreased urine volume, reduced skin heat dissipation, and the insulating effect of edema tissue. Certain skin diseases such as generalized dermatitis and ichthyosis also reduce the heat dissipation of the skin and cause fever.

⑤ Dysfunction of the temperature regulation center is commonly caused by physical factors, such as heat stroke; chemical factors, such as severe sleeping pill poisoning; mechanical factors, such as concussion, skull fracture, cerebral hemorrhage and increased intracranial pressure.

⑥Autonomic nervous system dysfunction. The degree of fever can be divided into low fever (37.3-38℃); moderate fever (38.1-39℃); high fever (39.1-41℃); and hyperpyrexia (above 41℃). Types of fever include remittent fever, remittent fever, intermittent fever, undulating fever, relapsing fever and irregular fever. Children with fever should be treated as emergencies, the cause should be identified as soon as possible, and targeted treatment should be given early. Young children should also pay attention to preventing high fever convulsions.

Overview

In normal people, under the control of the body temperature regulation center, the body's heat production and heat dissipation processes often maintain a dynamic balance. When the body is under the action of pyrogens or the body temperature center is dysfunctional, the heat production process increases, but the heat dissipation cannot increase accordingly or decreases, and the body temperature rises beyond the normal range, which is called fever. There are many causes of fever, which can be roughly divided into two categories clinically: infectious fever and non-infectious fever. The former includes fever caused by invasion of various pathogens such as bacteria, viruses, Mycoplasma pneumoniae, rickettsia, fungi, spirochetes and parasites.

type

Recurrent fever

Most of the cases are high fever, with body temperature often above 39°C and the temperature fluctuation range between day and night is within 1°C. It can last for days or weeks and is seen in certain acute infectious diseases such as typhoid fever, typhus, lobar pneumonia, etc.

Relaxation fever

Most of them are high fever, with varying body temperatures, which can reach above 39°C during fever, with a day and night fluctuation range of more than 1°C. Sometimes the body temperature can drop below 38°C, but the lowest temperature is still above the normal body temperature. It is common in suppurative diseases, sepsis, severe pulmonary tuberculosis, Kawasaki disease, advanced tumors, malignant histiocytosis, etc.

Irregular heat

When having a fever, the range of body temperature fluctuation is extremely irregular, the duration is uncertain, and the body temperature curve has no regular pattern. The body temperature is usually around 38°C or fluctuates between 37 and 40°C. It can be seen clinically in a variety of diseases, such as upper respiratory tract infection, mycoplasma pneumonia, pulmonary tuberculosis, pleurisy, infective endocarditis, rheumatic fever, leukemia, etc. It can also be seen in interference from drugs or physical cooling.

Wave Fever

The body temperature gradually rises, then gradually drops to low fever or normal temperature after a few days, and then gradually rises again after a few days. This cycle repeats itself, and the temperature curve is wavy, which is seen in brucellosis.