Long-term low fever is also seen in viral infections, mainly in infants, mostly in throat infections, without systemic manifestations. Generally, there is no obvious abnormality and no respiratory symptoms. Most of them are low-grade fever caused by virus infection after a long period of high fever.
Long-term low-grade fever may not be related to infection, but caused by other diseases or other reasons. Among hematological diseases, leukemia, aplastic anemia and hemolytic anemia can all be regarded as long-term low fever.
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Etiology and common diseases
1, infectious
It is the most common, accounting for about 40%. Among all infectious low-grade fever, tuberculosis infection is the most. Tuberculosis infection is characterized by low fever in the afternoon, and may be accompanied by cough, fatigue and sweating at night or after waking up.
Chronic low fever caused by chronic biliary tract infection, chronic pyelonephritis, chronic urinary tract infection, chronic pelvic inflammatory disease, chronic otitis media, chronic sinusitis, AIDS, subacute endocarditis and cytomegalovirus infection is also very common.
2. Function
Include physiological fever, seasonal fever, environmental fever and neurofunctional fever. In addition to environmental heat, it is more common in young women and children under 3 years old. It is mainly fever in the morning, and may also be accompanied by sweating, shaking hands, insomnia, fatigue and not wanting to eat.