Fever is one of the body’s most common responses to infection but despite how familiar it feels, many people still don’t know the best way to measure it or what to do when it appears. Whether you’re a parent with a sick child or an adult feeling under the weather, understanding how to properly monitor body temperature can make a real difference in how you respond to illness.
At Erdem Hospital, with 37 years of experience in patient-centered care, we believe that accessible medical knowledge is just as important as quality treatment. Here’s what you need to know about fever, including how to measure it accurately and when to seek medical attention.
What Is a Fever?
A fever is an elevated body temperature usually defined as a core temperature of 38°C (100.4°F) or higher. It’s not a disease in itself, but a symptom that often signals an infection, inflammation, or other immune response. Your body raises its internal thermostat as a way of fighting off viruses and bacteria, which are sensitive to heat.
In adults, a mild fever may simply mean your immune system is doing its job. In children, it often accompanies common illnesses like colds or ear infections. While a fever can make you feel uncomfortable, it’s not always something to panic about.
What Is Normal Body Temperature?
The “normal” body temperature can vary slightly from person to person, but the average oral temperature is around 36.5°C to 37.4°C (97.7°F to 99.3°F). It can fluctuate throughout the day due to activity, hormone levels, or even the time of day.
The following ranges can serve as general guidelines:
- Normal: Up to 37.4°C (99.3°F)
- Elevated: 37.5°C to 37.9°C (99.5°F to 100.2°F)
- Fever: 38.0°C and above (100.4°F and above)
Best Methods for Measuring Fever
Not all thermometers are created equal. Different types and techniques can lead to different results, and accuracy is especially important when monitoring infants, elderly patients, or those with underlying health issues.
Here are the most common methods:
1. Oral (Mouth) Temperature
Suitable for adults and older children, this is one of the most common ways to measure temperature. Be sure the person hasn’t eaten or drunk anything hot or cold for at least 15 minutes beforehand.
2. Rectal Temperature
This method gives the most accurate reflection of core body temperature and is recommended for infants under 3 months. Rectal readings tend to be about 0.5°C higher than oral ones.
3. Axillary (Underarm) Temperature
Though easy to take, this method is less accurate. It’s best used as a quick screening tool rather than a diagnostic method.
4. Tympanic (Ear) Temperature
Special ear thermometers can give a reliable reading, but incorrect positioning can lead to error. It’s ideal for children over 6 months.
5. Temporal Artery (Forehead) Temperature
This contactless method is increasingly popular for its convenience and hygiene, especially in clinics and hospitals. However, results can be affected by sweat or ambient temperature.
When Is Fever Dangerous?
A slight fever isn’t always cause for concern. But in some cases, medical attention is necessary.
Seek help if:
- An adult has a fever above 39°C (102.2°F) that lasts longer than two days
- A child under 3 months has a rectal temperature over 38°C (100.4°F)
- The fever is accompanied by severe headache, rash, shortness of breath, confusion, or persistent vomiting
- A person with chronic illness (e.g., diabetes, heart disease) develops a fever
- A fever persists despite antipyretics like paracetamol or ibuprofen
What Should You Do During a Fever?
If you or your child has a mild fever:
- Stay hydrated with water, herbal teas, or electrolyte drinks
- Rest to support the immune system
- Wear light clothing and keep the room at a moderate temperature
- Use fever reducers if advised by a doctor
Avoid over-bundling or cold showers these can cause more harm than good by interfering with the body’s natural regulation mechanisms.
When in Doubt, Ask for Help
While home care is often sufficient for mild fevers, professional evaluation is sometimes essential especially when symptoms escalate or persist. At Erdem Hospital, our experienced medical team is here to support you with reliable diagnostics and compassionate care.
Whether you’re managing a child’s high temperature or uncertain about your own symptoms, don’t hesitate to contact a healthcare provider. Fever is the body’s way of signaling that something’s off. Listening to it and knowing how to respond can help you heal faster and smarter.
Erdem Hospital: Empowering Patients With Knowledge and Care
With over three decades of trusted healthcare experience, Erdem Hospital continues to offer evidence-based medical care and personalized attention for every patient. From primary health consultations to complex diagnostics, our doors are open to individuals and families seeking clarity, comfort, and clinical excellence.
Let us be your partner in health every step of the way.