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[Prolonged fever: specific issues in the young adult population]
Summary
Prolonged unexplained fever diagnosis remains challenging for internists. While causes are similar, infectious and neoplastic cases are decreasing, with inflammatory and unknown origins comprising 30-50% of prolonged fever cases.
Area of Science:
- Internal Medicine
- Infectious Diseases
- Rheumatology
Background:
- Prolonged unexplained fever (PUF) has been studied since the 1960s, yet remains a diagnostic challenge.
- The distribution of PUF causes has shifted over time, with a notable decrease in infectious and neoplastic etiologies.
- Inflammatory disorders and fevers of unknown origin account for a significant proportion (30-50%) of PUF cases.
Purpose of the Study:
- To review the specific challenges and management of prolonged unexplained fever in young adults.
- To discuss the common etiologies of prolonged fever, including infection, inflammation, neoplasia, and other causes.
- To highlight the generally favorable prognosis of PUF when initial management is thorough.
Main Methods:
- Review of early studies and contemporary data on prolonged fever.
- Analysis of etiological distribution across different age groups.
- Discussion of management strategies and diagnostic approaches for young adults.
Main Results:
- Infectious and neoplastic causes of PUF are decreasing across all age groups.
- Inflammatory conditions and unknown causes constitute 30-50% of PUF cases.
- The prognosis for undiagnosed PUF is typically favorable, with rare instances of life-threatening diagnoses upon follow-up.
Conclusions:
- Prolonged unexplained fever requires a systematic diagnostic approach, considering infection, inflammation, neoplasia, and other causes.
- Management in young adults presents unique considerations.
- A complete and accurate initial workup is crucial for a favorable prognosis in PUF.
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Increased Body Temperature
A body temperature above 38°C (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in response to an infection or illness.
Types of Fever
Fever can be triggered by several factors, including infections, nervous system disorders, certain cancers, blood diseases like leukemia, embolism, thrombosis, heatstroke, dehydration, surgical trauma, crushing injuries, and allergic reactions.
Here are the different types of fever:
Here are the different types of fever:
Patterns of Fever
Before understanding the types and patterns of fever, it is essential to know its phases.
Methods of reducing fever
The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
Pharmacological Methods of Reducing Fever:
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