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Types of Fever

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:

Increased Body Temperature

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.

Patterns of Fever

Patterns of Fever

Before understanding the types and patterns of fever, it is essential to know its phases.

Methods of reducing fever

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:

Viral Meningitis

Viral Meningitis

Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...

Encephalitis l: Introduction

Encephalitis l: Introduction

Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...

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Related Experiment Video

Updated: May 12, 2026

Detection of Infectious Virus from Field-collected Mosquitoes by Vero Cell Culture Assay

Detection of Infectious Virus from Field-collected Mosquitoes by Vero Cell Culture Assay

Published on: June 9, 2011

[Fever of unknown origin].

B Salzberger¹, M Müller-Schilling, M Fleck

¹Klinik und Poliklinik für Innere Medizin I, Universitätsklinikum Regensburg, Regensburg, Deutschland.

Zeitschrift Fur Rheumatologie

|April 5, 2013

Summary

Fever of unknown origin (FUO) presents a diagnostic challenge, often remaining unexplained after thorough evaluation. This review covers key diagnostic strategies and treatments for FUO patients.

Area of Science:

Internal Medicine
Infectious Diseases
Clinical Immunology

Context:

Fever of unknown origin (FUO) is defined as sustained unexplained fever despite intensive diagnostic evaluation.
FUO presents a significant diagnostic challenge, requiring a systematic approach.
Classification includes classical, nosocomial, neutropenic, and HIV-associated FUO based on patient-specific factors.

Purpose:

To review the diagnostic aspects of FUO.
To discuss therapeutic options for FUO patients.
To provide an overview of the challenges and approaches in managing unexplained fevers.

Summary:

Infections, malignant diseases, and non-infectious inflammatory diseases are primary considerations for FUO.
Despite extensive work-ups, a definitive diagnosis remains elusive in a substantial number of FUO cases.

Related Experiment Videos

Last Updated: May 12, 2026

Detection of Infectious Virus from Field-collected Mosquitoes by Vero Cell Culture Assay

Detection of Infectious Virus from Field-collected Mosquitoes by Vero Cell Culture Assay

Published on: June 9, 2011

This review focuses on diagnostic strategies and therapeutic interventions for FUO.

Impact:

Aids clinicians in diagnosing and managing complex FUO cases.
Highlights the importance of considering diverse etiologies in unexplained fevers.
Contributes to improved patient outcomes by outlining current diagnostic and therapeutic standards.