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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...

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:

Patterns of Fever

Patterns of Fever

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

Decreased Body Temperature

Decreased Body Temperature

A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...

Inflammatory Response I: Vascular and Cellular

Inflammatory Response I: Vascular and Cellular

The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...

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Related Experiment Video

Updated: Jun 28, 2025

Granulocyte-dependent Autoantibody-induced Skin Blistering

Granulocyte-dependent Autoantibody-induced Skin Blistering

Published on: October 12, 2012

Fever and Rash.

Richard Diego Gonzales Y Tucker¹, Aravind Addepalli²

¹Department of Emergency Medicine, University of California San Francisco, Box 0209, 505 Parnassus Avenue, San Francisco, CA 94143, USA; Department of Emergency Medicine, Alameda Health System - Wilma Chan Highland Hospital, 1411 E 31st Street, Oakland, CA 94602, USA.

Emergency Medicine Clinics of North America

|April 19, 2024

Summary

Diagnosing fever and rash in the emergency department is challenging. Rapidly identifying life-threatening infections from benign rashes requires thorough patient history and physical examination.

Keywords:

Arbovirus Emergency medicine Exanthem Fever Meningococcemia Rash Rocky Mountain spotted fever Toxic shock syndrome

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Granulocyte-dependent Autoantibody-induced Skin Blistering

Granulocyte-dependent Autoantibody-induced Skin Blistering

Published on: October 12, 2012

Author Spotlight: Advancing Pathogen Detection and Disease Assessment in Real-Time Using M-ROSE

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Published on: January 19, 2024

Area of Science:

Emergency Medicine
Infectious Diseases
Dermatology

Background:

Fever and rash presentations are common in emergency departments.
Distinguishing serious infections from benign conditions is diagnostically challenging.
Noninfectious causes also present with fever and rash.

Purpose of the Study:

To highlight the diagnostic challenges of fever and rash in emergency settings.
To emphasize the importance of clinical diagnosis in emergent cases.
To guide emergency providers in managing patients with fever and rash.

Main Methods:

Review of clinical presentations and diagnostic approaches for fever and rash.
Emphasis on detailed patient history and comprehensive physical examination.
Discussion of differential diagnoses including infectious and noninfectious causes.

Main Results:

Most emergent causes of fever and rash are clinical diagnoses.
Benign exanthems are more common than life-threatening infectious rashes.
Serious noninfectious causes must also be considered.

Conclusions:

Accurate diagnosis relies on exhaustive history and head-to-toe skin assessment.
Provisional diagnosis and prompt treatment are crucial pending lab results.
Effective management requires distinguishing emergent from non-emergent conditions.