What is the reason for the child to have a fever every two or three days?

If a child has a fever every other day, the most common cause is low immunity, coupled with the fact that parents do not take better care of their children's bodies. Once this happens, the fever needs to be reduced as soon as possible. This can avoid many problems and will not damage any normal cell tissues in the baby's body, which can better relieve the symptoms.

1) Juvenile rheumatoid arthritis is the most common rheumatic disease. In recent years, as streptococcal infections have been promptly controlled, rheumatic fever has become less common. Other rheumatic diseases that cause fever include systemic lupus erythematosus, polyarteritis nodosa, Kawasaki disease, serum sickness, dermatomyositis, nodular nonsuppurative panniculitis, Wegener's malignant granulomatosis, and angioimmunoblastic lymphadenopathy.

2) Malignant tumors with tissue destruction or necrosis, with leukemia being the most common, and others including malignant lymphoma (including Hodgkin's and non-Hodgkin's lymphoma), neuroblastoma, malignant histiocytosis, Langerhans' histiocytosis and Ewing's sarcoma; large-area burns, after major surgery, internal bleeding absorption process, vascular embolism, etc.

3) Excessive heat production or reduced heat dissipation Excessive heat production is seen in hyperthyroidism, status epilepticus, and adrenal hyperfunction; reduced heat dissipation is seen in generalized dermatitis, massive water loss, blood loss, heat stroke, congenital ectodermal dysplasia, and excessive wrapping of newborns.

4) Diseases of the hypothalamic temperature regulation center such as skull injury, cerebral hypoplasia, intracranial tumors, subarachnoid hemorrhage, heat stroke, toxic encephalopathy, sequelae of encephalitis and diencephalic lesions.

5) Autonomic dysfunction such as functional hypothermia and chronic nonspecific lymphocytosis.

6) Other drug fever, drug poisoning (such as salicylic acid, atropine), blood transfusion or infusion reaction, hypernatremia (pituitary or nephrogenic diabetes insipidus), inflammatory bowel disease and immunodeficiency disease, etc.

3. Chronic low fever (long-term low fever)

It refers to a patient with a slow onset, a body temperature between 37.5 and 38.0°C, and a duration of more than 4 weeks. 40% were infectious fevers, 57% were non-infectious fevers, and 3% were of unknown cause.

First, tuberculosis, including pulmonary tuberculosis, should be excluded; chronic low-grade fever is often caused by infection, such as post-streptococcal syndrome and other post-infectious fever, and the presence of chronic lesions or small abscesses should be sought, such as chronic crypt tonsillitis, lymphadenitis, sinusitis, dental caries, gingival abscesses, perianal abscesses, etc.

Non-infectious diseases of chronic low fever include hyperthyroidism, diabetes insipidus, rheumatic diseases, inflammatory bowel disease (Crohn's disease and ulcerative colitis), blood diseases, summer fever, excessive protein intake and prolonged temperature testing.

Excluding the above causes, if the cause of low fever still cannot be found, but the child does not have any illness, only follow-up observation is needed, and the low fever can return to normal on its own after a few weeks.