Fever: What You Can Do & When It Becomes Critical

Fever is a powerful signal from your immune system – often a sign of an infection, but sometimes also a reaction to external factors or medication. When the thermometer rises, uncertainty often increases as well. Here you'll learn how to correctly interpret a fever, what can help you in everyday life, and how to use brite to check whether your medication or a new drug is affecting your body temperature.

In short & important: what you can do right now

What is a fever – and when do we start talking about one?

Fever (pyrexia) is not an illness, but an active defense mechanism. Many people wonder: When does one have a fever? In medicine, a body temperature of 38.0 °C or higher is considered a fever, and 39.0 °C or higher is considered a high fever. Ideally, the temperature should be measured rectally or in the ear, as these measurements are the most accurate. However, it's not just the number that's important, but also how you feel: shivering (chills) indicates that the temperature is rising; sweating often signals that the body is trying to get rid of the heat.

Common causes of fever

Why does the temperature rise? These are the most common everyday triggers:

Infections (colds, flu, etc.)

Viruses and bacteria are the most common causes. They are often accompanied by body aches, sore throat, or a runny nose.

Fever without a cold

This is unsettling for many sufferers. Possible causes include inflammatory processes in the body, bladder infections, or overexertion. If the fever persists without clear symptoms, a medical examination after 2-3 days is advisable.

Fever at night

Body temperature fluctuates throughout the day and often reaches its peak in the evening. Night sweats and rising fever at night are typical of many infections.

Drug fever triggers

An often underestimated factor: Fever can be a side effect of medication or caused by drug interactions. This connection should be checked, especially when starting a new medication or changing the dosage.

Is it due to your medication? Get to the bottom of it now

Especially when fever occurs without classic signs of infection, a look at your medication list is crucial. brite helps you bring structure to the analysis:

• Digital medication plan: Record all medications and immediately see if the fever correlates with a new prescription or intake.
• Drug interaction check: Find out if your combination of medications affects your immune system or your thermoregulation.
• Dosage reminder: Make sure you take fever reducers at the correct intervals to avoid overdosing.

When does fever become critical?

Fever usually resolves itself, but you should see a doctor or call emergency services if:

• the fever rises above 40 °C or cannot be reduced despite medication
• severe neck stiffness occurs (chin cannot be placed on chest)
• you are confused or have impaired consciousness
• the fever lasts longer than three days (three-day fever)
• new, dark skin spots or a rash appear

Preparing for your doctor's appointment – your checklist

To help your doctor quickly find the cause, prepare this information:

• Course: How did the temperature change throughout the day?
• Measurement method: Where and how often did you measure?
• Accompanying symptoms: Do you also experience shortness of breath or nausea?
• Medications: Bring your complete list from the brite app – over-the-counter fever reducers such as ibuprofen or paracetamol must also be on the list.

How brite helps you keep track of everything

brite brings structure to your recovery phase and helps you find the cause of your elevated temperature:

• A centralized medication plan for maximum safety during doctor's visits.
• Examination of drug interactions in drug-induced fever.
• Stable routines thanks to the medication reminder.