Track your fevers
A fever is your body's survival mechanism against infection. Monitoring their peaks and duration is critical for understanding the severity of an illness and the effectiveness of treatment.
Why track this symptom?
- Track the frequency and timing of fever spikes accurately.
- Monitor how your body responds to fever-reducing medication.
- Provide a precise temperature history for medical consultations.
How Trace Health helps
When a fever strikes, you don't want to navigate complex menus. Trace Health's one-tap logging lets you record temperature spikes instantly, creating a reliable medical record while you focus on recovery.
Common causes
Viral infections like influenza, common cold, and gastroenteritis are the most frequent causes of fever, typically producing temperatures between 100-102°F (37.8-38.9°C). Bacterial infections including strep throat, urinary tract infections, and pneumonia often cause higher fevers above 102°F with more severe accompanying symptoms. Inflammatory conditions such as autoimmune disorders can trigger recurrent low-grade fevers that come and go over weeks. Certain medications, heat exhaustion, and recent vaccinations can also elevate body temperature as normal immune responses.
When to see a doctor
Seek emergency care immediately if fever exceeds 104°F (40°C), or if any fever is accompanied by severe headache with neck stiffness, difficulty breathing, or altered mental status. These symptoms may indicate serious conditions like meningitis or sepsis requiring urgent treatment.
Frequently Asked Questions
What should I record when tracking a fever?
Log your temperature, time of measurement, any associated symptoms like chills, body aches, or sore throat, medications taken, and fluids consumed. Track whether temperature follows a pattern (higher at night, morning improvement).
How does a fever log help my doctor?
Fever patterns are diagnostic. Intermittent fevers suggest different conditions than constant or recurring ones. Your log showing temperature curves, duration, and associated symptoms helps your doctor narrow down causes efficiently.
When should I see a doctor about a fever?
See a doctor if fever exceeds 39.4 C (103 F), lasts more than three days, or is accompanied by severe headache, stiff neck, rash, or difficulty breathing. For children, seek care for any fever in infants under 3 months.
How frequently should I take and log my temperature when I have a fever?
Take and log your temperature every 4-6 hours while awake, including before and after taking fever-reducing medications. Always use the same thermometer and measurement site (oral, ear, or temporal) for consistency. More frequent monitoring during high fevers helps track medication effectiveness and identifies dangerous temperature spikes that may require immediate medical attention.
Should I track fever patterns differently for recurring fevers versus one-time illness?
Yes, recurring fevers require longer-term tracking to identify patterns that may indicate chronic conditions. Log fever-free intervals, associated symptoms, and any triggers like stress or travel. Single illness fevers focus on daily progression and recovery, while recurring fevers need weeks or months of data to reveal cycles that help doctors diagnose underlying autoimmune or infectious conditions.
Your health data stays on your iPhone.
No account. Private. No personal information is ever requested. Your health data stays on your iPhone by default. A backup option to your private iCloud is available. Trace Health never collects or sells your health data.
What people say
Rated 4.8 out of 5 from 45+ ratings on the App Store.
- “This app is wonderful. You can add symptoms and rearrange them as you like. The best part: your sensitive health data is only stored on your own device.” (WhoKnowsTypo, Netherlands)
- “Finally a simple iOS 26 symptom reporting app, thank you 😀” (stranack, United Kingdom)
Read the complete guide: How to Track Fever: A Complete Guide →