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What is Fever?
Fever is one of the most common medical symptoms experienced by people of all ages. It is not a disease itself but rather a sign that the body is fighting an infection or illness. A temporary rise in body temperature helps the immune system respond to harmful invaders such as bacteria and viruses.
While most fevers are mild and resolve on their own, some may indicate serious underlying conditions that require medical attention.
What Defines a Fever?
Fever is defined as a temporary increase in body temperature, usually above the normal range of 36.5°C to 37.5°C (97.7°F to 99.5°F). A temperature of 38°C (100.4°F) or higher is generally considered a fever.
It is part of the body’s natural defense mechanism and often accompanies infections or inflammatory conditions.
Common Causes of Fever
While infections are the most frequent culprits, several other factors can trigger a rise in body temperature.
Infectious Causes
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Viral Infections: The flu and the common cold are primary triggers.
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Bacterial Infections: Conditions like pneumonia, urinary tract infections (UTIs), and meningitis.
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Kidney Infections: As discussed in renal care, a fever accompanied by back pain often indicates a kidney-related infection (pyelonephritis).
Non-Infectious Causes
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Inflammation: Autoimmune diseases like rheumatoid arthritis or Lupus.
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Heat Exhaustion: Exposure to high temperatures and dehydration can overwhelm the body’s cooling mechanisms.
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Immunizations: It is common for children and adults to develop a mild fever after receiving vaccines as the immune system builds a “memory” of the pathogen.
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Medications: Certain antibiotics and blood pressure medications can cause “drug fever” as a side effect.
What are the types of Fever?
There are multiple types of fever based on the intensity, duration, or the set patterns of temperature fluctuations evident:
Sustained Fever:
Also termed as continuous fever, here the temperature sustains above the normal levels without major fluctuation. This can be a symptom of typhoid or pneumonia.
Intermittent Fever:
Here, the temperature increases above normal levels multiple times in a day or over 24 hours. It’s like a pendulum; it increases above normal and then returns to normal.
This is evident during malaria, where the increase in temperature corresponds with the parasite’s activity.
Relapsing Fever:
Here, fever exists for a few days, then for days and weeks it’s normal. Again, it comes back, and the cycle continues. This is evident in Borrelia infections or tick-borne, specific cancers like Hodgkin’s lymphoma.
Remittent Fever:
Here, temperature varies by 2 degrees Celsius throughout the day but never returns to normal levels. This is evident in bacterial and viral infections, for example, infective endocarditis.
Hyperpyrexia:
This is a rare situation in which the temperature exceeds 41.1°C (106°F). This is a highly serious and life-threatening situation. It mainly occurs due to severe infection, heatstroke, or Central Nervous System (CNS) issues.
How to diagnose Fever?
Checkup usually begins by measuring temperature using thermometers, placing the thermometer inside the mouth or under the armpit, or under the ear.
Besides measuring temperature, doctors look for the primary cause of fever through:
Medical History and Physical Examination: Doctors check for symptoms like a cold, cough, infection, abdominal pain, long travel, or any new medication.
Blood Tests: CBC test for Complete Blood Count helps identify whether it was due to a virus or a bacterium. Metrics like CRP or C – reactive protein and ESR help verify inflammation.
Specialized Testing: Based on the prior medical track record of the patient, the doctor might ask for testing for dengue, malaria, or typhoid.
Imaging: In case of pneumonia or abscesses, an X-ray and a CT scan of the chest may be prescribed.
What is the treatment of Fever?
Doctors do not look forward to just reducing the temperature, but their medication and procedures work to solve the underlying problem.
In some situations, a mild fever is actually beneficial as it helps in fighting against infections.
Pharmacological Treatment:
Medicines like Paracetamol or NSAIDs like ibuprofen are prescribed to ease discomfort and reduce the temperature. These are basic medicines generally prescribed to all fever patients initially.
If a fever occurs due to bacterial infection, then antibiotics are prescribed.
Non-Pharmacological Treatment:
Hydration: Fever results in dehydration due to fluid outflow through sweating. So, better keep yourself hydrated with water and healthy juices.
Rest: Avoid any extensive physical activity or workout; taking rest is essential. Any vigorous physical activity will further increase the temperature.
External Cooling: Wear light and relaxed clothes to let air flow easily. Apply a lukewarm sponge to reduce heat. Avoid alcohol or cold water rubbing on your body, as it will further increase temperature.
How long does a fever last?
Most fevers follow a predictable pattern as the immune system identifies and neutralizes a threat.
Viral Infections (2–5 Days)
Common viruses like the flu, the common cold, or RSV typically cause fevers that peak within the first 48 hours and gradually subside as the body builds antibodies.
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Note: Some viral strains, such as mononucleosis, can cause “lingering” fevers that last 7 to 10 days.
Bacterial Infections (Variable)
A fever caused by bacteria (like strep throat or a urinary tract infection) typically will not break on its own until antibiotic treatment begins.
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The “24-Hour” Rule: Most bacterial fevers begin to drop within 24 to 48 hours after the first dose of an effective antibiotic.
Post-Vaccination (1–2 Days)
It is normal for children and adults to develop a low-grade fever after certain immunizations. These are usually short-lived and resolve within 24 to 48 hours.
When to Seek Medical Attention
Fever in infants under 3 months with a temperature of 39°C (102°F) or higher.
Fever that lasts more than three days or hits 40°C (104°F) or higher.
If you experience severe headache, rash, stiff neck, or difficulty breathing.
This information is for informational purposes only and does not constitute medical advice. Consult a professional for diagnosis and treatment.