Last updated on May 13th, 2025 at 05:05 am
Fitness trackers like Fitbit have gained popularity as essential tools for monitoring health and staying active. However, questions about possible side effects, radiation exposure, and long-term health impacts are becoming more common. In this article, we’ll address concerns like “Can Fitbit cause cancer?” or “Does Fitbit emit harmful radiation?” based on scientific findings and real-world experiences. Let’s separate fact from fiction and provide actionable advice on safe Fitbit usage.
Can Fitbit Harm Your Body?
A common question among new users is: Are Fitbits safe to wear every day? The short answer is yes—Fitbit devices are considered safe for most individuals. These wearable fitness trackers use low-level RF (radiofrequency) and EMF (electromagnetic field) radiation to sync data with smartphones and other devices. According to health authorities and Fitbit’s own testing, the radiation emitted is non-ionizing and well below harmful levels.
Although some users have reported minor issues like slight headaches or wrist discomfort, these are rare and typically related to how the device is worn. There’s no solid scientific evidence showing Fitbit causes significant harm or long-term damage to the human body.
Can Fitbit Cause Cancer?
This concern has caused anxiety among some users, but there is no scientific proof that Fitbit causes cancer. The idea that wearable tech like fitness trackers increases cancer risk is primarily based on confusion around RF radiation. But unlike ionizing radiation (e.g., X-rays), the type Fitbit emits is considered harmless at low levels.
A 2020 study by the World Health Organization (WHO) concluded that the low-frequency EMF radiation from wearable devices is unlikely to pose serious health risks, especially when used as directed. Fitbit complies with strict regulatory standards in multiple countries to ensure its products are safe for daily use.
Fitbit Side Effects: What You Should Know
Like any wearable device, Fitbits can cause minor side effects for some users. Common issues include:
- Skin irritation or allergic reactions, especially when worn too tightly or for long periods.
- Fitbit burning skin sensation, often due to heat buildup or moisture trapped under the band.
- Pressure marks or welts, typically from prolonged wear or tight straps.
To avoid these problems, follow these simple safety tips:
- Loosen the band to allow airflow.
- Remove the device before showering or charging.
- Clean the band regularly with mild soap and water.
- Avoid wearing the device 24/7; give your skin time to breathe.
Fitbit and Heart Palpitations: Myth or Fact?
Some users have raised concerns about Fitbit causing heart palpitations, but research does not support this claim. In fact, Fitbit is designed to help monitor heart rate, not disrupt it. However, Fitbit heart rate accuracy issues can sometimes give incorrect readings, especially during high-intensity workouts.
Studies have shown that heart rate data may be less reliable during fast, jerky movements, which could lead to unnecessary stress if users believe the data is entirely accurate. That said, most users find Fitbit’s heart tracking useful for spotting trends, even if occasional inaccuracies occur.
Pro tip: For best results, tighten the band slightly during exercise, but loosen it afterward.
Fitbit Burning Skin – Why It Happens and How to Prevent It
Some users have reported Fitbit burning skin after extended use, especially during warm weather or workouts. This issue is usually related to:
- Wearing the band too tightly.
- Allowing sweat or water to accumulate under the strap.
- Wearing the Fitbit while charging (which is not recommended).
The good news is that Fitbit skin burn issues are easily preventable. Simply adjust how you wear your device, clean it frequently, and avoid using it when wet or overheated.
Is Fitbit Radiation Harmful?
Fitbit emits a small amount of RF radiation to maintain Bluetooth and wireless syncing capabilities. This level is far below the threshold considered harmful by health organizations like the FDA, WHO, and FCC.
However, those sensitive to RF signals or concerned about long-term exposure can take precautions:
- Use airplane mode when not syncing.
- Avoid sleeping with the device if unnecessary.
- Choose models with minimal connectivity features.
Are the Green Lights on Fitbit Harmful to the Eyes?
Fitbit devices use green LED lights to measure blood flow and heart rate through your wrist. These low-power lights are not harmful and are specifically designed for safe skin contact. They are never in direct contact with your eyes, making the risk of eye damage virtually nonexistent.
However, if you’re sensitive to flashing lights or light at night, consider switching off heart rate tracking while sleeping.
Conclusion: Should You Worry About Fitbit Side Effects?
After reviewing the facts, we can confidently say that Fitbit is safe for most users. The side effects—such as minor skin irritation or inaccurate heart rate data—are not dangerous and can be managed with simple habits.
Here’s what to remember:
- Fitbit doesn’t cause cancer or serious health issues.
- Radiation levels are extremely low and within global safety limits.
- Skin irritation and burning can be avoided by wearing your device properly.
- If you’re sensitive to EMF or RF, reduce usage or switch to airplane mode.
If you’re still unsure, consult with a medical professional—especially if you have pre-existing skin or heart conditions.