The pattern of Fever: A Comprehensive Overview

The Pattern of Fever: A Comprehensive Overview


Have you ever noticed how a fever behaves? It isn’t always constant; it changes, and it has patterns. Understanding these fever patterns can provide critical insights into the underlying causes and guide the treatment approach. In this article, we’ll dive into the complexities of fever, exploring its patterns, causes, diagnoses, and treatment options.

Understanding Fever

The Normal Body Temperature Range

Before we delve into fever patterns, let’s clarify what a fever is. A fever is defined as a temporary increase in body temperature, often due to an illness. An average body temperature for a healthy person usually falls between 36.5–37.5 degrees Celsius (97.7–99.5 degrees Fahrenheit), and anything above this range is typically considered a fever.

What Triggers Fever

Fever is often a symptom, not an illness in and of itself, and it is the body’s natural response to fighting infections from viruses or bacteria. Other causes include heat exhaustion, certain inflammatory conditions, and some medications.

Fever Patterns and Associated Diseases

  1. Continuous Fever
    • Associated Diseases: Pneumonia, Typhoid, Tuberculosis
    • Pattern: Continuous fever is characterized by a body temperature that remains consistently above the normal range throughout the day, with fluctuations no more than 1 degree Celsius over 24 hours.
  2. Intermittent Fever
    • Associated Diseases: Malaria, Septicemia, Pyemia
    • Pattern: Intermittent fever is marked by periods of temperature elevation followed by periods of average temperature. The elevated temperature doesn’t last throughout the day, and “intermittently” comes and goes.
  3. Remittent Fever
    • Associated Diseases: Infective Endocarditis, Brucellosis
    • Pattern: A remittent fever is when the body temperature fluctuates significantly throughout the day (more than 2 degrees Celsius) but doesn’t reach the average level.
  4. Pel-Ebstein Fever
    • Associated Disease: Hodgkin’s Lymphoma
    • Pattern: This is a unique fever pattern characterized by a long period of high fever, typically lasting 3 to 10 days, followed by a period of average temperatures, also lasting several days. This cycle repeats in a steady rhythm.
  5. Hectic Fever
    • Associated Diseases: Severe infections such as Septicemia
    • Pattern: A hectic fever is a high fever that fluctuates significantly during the day. It’s often accompanied by severe sweating and chills.
  1. Relapsing Fever
    • Associated Diseases: Tick-borne relapsing fever (caused by Borrelia species transmitted by ticks), Louse-borne relapsing fever (caused by Borrelia recurrentis transmitted by lice)
    • Pattern: Relapsing fever is marked by periods of high fever lasting several days, followed by symptom-free periods of similar duration. This cycle can repeat multiple times without treatment.
  2. Tertian Fever
    • Associated Disease: Malaria (caused explicitly by Plasmodium vivax and Plasmodium ovale)
    • Pattern: Tertian fever displays a fever spike every third day. The design derives from the lifecycle of the Plasmodium parasites that cause it.
  3. Quartan Fever
    • Associated Disease: Malaria (caused explicitly by Plasmodium malaria)
    • Pattern: Quartan fever presents a fever spike every fourth day, coinciding with the lifecycle of the Plasmodium malariae parasite.
  4. Neutropenic Fever
    • Associated Conditions: Neutropenia, often resulting from chemotherapy or other treatments that suppress the immune system
    • Pattern: Neutropenic fever occurs in patients with a significantly low count of neutrophils, a type of white blood cell, making them more susceptible to infections. A single oral temperature of 38.3 degrees Celsius (101 Fahrenheit) or a temperature greater than 38.0 degrees Celsius (100.4 Fahrenheit) for over 1 hour could be considered a neutropenic fever.
  5. Fuhrman’s Fever
  • Associated Disease: Amebic Liver Abscess
  • Pattern: Fuhrman’s fever is a kind of hectic fever characterized by high temperatures in the evening with chills and profuse sweating, particularly seen in amebic liver abscesses.

These fever patterns and their associated diseases showcase the array of ways in which the body reacts to different illnesses. But it’s important to remember that these patterns should not be used as a sole diagnostic tool. The presence of fever, other symptoms, and medical findings provide the best chance for an accurate diagnosis and treatment plan.


1. How can I tell what kind of fever pattern I have?

Recording your temperature at regular intervals throughout the day can help identify a pattern. Always consult with a healthcare professional for accurate diagnosis.

2. What should I do if my fever doesn’t go away?

If your fever persists for over a few days, seeking medical attention is important.

3. Can a fever be dangerous?

While most fevers are harmless and go away on their own, a very high fever can be dangerous, particularly for children and the elderly.

4. How can I bring down a fever at home?

Stay hydrated, rest, and consider non-prescription medicines to reduce fever. This should only be used for temporary relief and are not a substitute for medical advice.

5. Can a fever indicate a serious condition?

While fever is a common symptom of many minor illnesses, it can sometimes be a sign of a more serious condition, especially if accompanied by other severe symptoms. Always consult with a healthcare professional if you have any concerns.

6. What is relapsing fever?

Relapsing fever is characterized by episodes of fever interspersed with periods of no symptoms. This pattern can continue for several weeks if left untreated. It’s often caused by certain bacteria transmitted by ticks or lice.

7. What are tertian and quartan fevers?

These patterns are seen in different types of malaria. Tertian fever exhibits a fever spike every third day, while quartan fever has a spike every fourth day.

8. How is fever used as a diagnostic tool?

Fever can indicate an underlying issue, and its pattern can offer more specific clues to the cause. The response of fever to treatments can also provide diagnostic information. Finally, the degree of fever can sometimes suggest the severity of the underlying condition.

9. What is a Relapsing Fever? Relapsing fever is characterized by cycles of high fever lasting several days, followed by symptom-free periods of similar duration. This cycle can repeat multiple times without treatment.

10. What are Tertian and Quartan Fevers? Tertian and quartan fevers are associated with different types of malaria. Tertian fever presents a fever spike every third day, while quartan fever presents a fever spike every fourth day.


  1. CDC’s Information on Fever
  2. Mayo Clinic’s Resource on Fever
  3. World Health Organization’s (WHO) Guide on Malaria
  4. American Cancer Society’s Information on Hodgkin’s Lymphoma
  5. WebMD’s Article on Understanding Fever Basics

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Tanzir Islam Britto

Hello, I'm Dr. Tanzir Islam Britto. As a dedicated physician, I've embarked on my medical journey at Bangabandhu Sheikh Mujib Medical College (BSMMC), previously known as Faridpur Medical College, where I pursued my Bachelor of Medicine and Bachelor of Surgery (MBBS). I completed my degree at Shahabuddin Medical College (SMC). Alongside my medical career, I am an amateur writer and an active social media advocate, where I share insights into health, wellness, and more.

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