Why does a child have a recurring fever in a week?

Young children have low resistance and immunity, and are easily infected by germs, thus suffering from diseases, most commonly fever, and the fever is repeated. When a child has a fever repeatedly for a week, it means that the condition is somewhat serious. The patient must find the cause of the disease and take correct treatment, otherwise it will endanger the child's health and affect his normal life. So what is the reason for a child to have a fever repeatedly for a week?

Fever is caused by the action of fever activators on the body, which in turn leads to the production of endogenous pyrogens (EP) and enters the brain to act on the body temperature regulation center, which in turn leads to the release of fever center mediators, which in turn causes a change in the set point and ultimately causes fever. Common fever activators include exogenous pyrogens from outside the body: bacteria, viruses, fungi, spirochetes, malarial parasites, etc.; and those from inside the body: antigen-antibody complexes, steroids, etc. Endogenous pyrogens (EP) come from EP-producing cells in the body, and their main types include: interleukin-1 (IL-1), tumor necrosis factor (TNF), interferon (IFN), interleukin-6 (IL-6), etc. EP acts on the body temperature regulation center located in the POAH, resulting in the production of positive and negative regulatory mediators. The latter may cause a change in the set point and ultimately lead to the generation of heat.

Fever itself is not a disease, but a symptom. In fact, it is one of the body's mechanisms for fighting infection. Fever may even have its uses: shortening the duration of illness, enhancing the effectiveness of antibiotics, and making infections less contagious. These abilities should offset the discomfort experienced when having a fever.

The etiology of fever of unknown origin (FUO) is a global problem, and the cause of nearly 10% of FUO cases remains unknown. Fever itself can be caused by many types of diseases, such as infection, tumors, autoimmune diseases and blood diseases, and cannot be clearly classified. In the past, such patients were usually diagnosed and treated by internal medicine physicians, and in most hospitals with more specialized specialties, they were mainly treated by respiratory physicians. Currently, many hospitals have opened infection departments and FUO is classified as such in the infection departments. This specialized management is an improvement and can improve the level of diagnosis and treatment. FUO has an accurate definition, which includes three key points: ① fever lasts ≥ 3 weeks; ② body temperature is > 38.3℃ for multiple times; ③ the diagnosis cannot be confirmed after ≥ 1 week of complete medical history, physical examination and routine laboratory tests. It can be seen that although FUO itself is a symptom diagnosis rather than a disease diagnosis, the diagnostic requirements are very strict.

It is very harmful if a young child has repeated fevers within a week. Different degrees of fever have different effects on the patient, but they are all bad for the body. Therefore, if you find that your child has a fever repeatedly for a week, you should take your child to the hospital for a regular check-up to prevent the fever from being caused by other diseases. Only by treating the disease symptomatically can the fever be controlled, otherwise it will make the disease more serious.