08/05/2026
WHY IS MY CGM LYING TO ME TODAY?!?
One minute you're cruising. The next your CGM says you're LOW while you feel completely fine...or suddenly DOUBLE ARROWS UP after doing absolutely nothing.
Spotty, jumpy or inaccurate CGM readings can happen, and it's so frustrating for kids, teens, adults and parents trying to make safe decisions.
Here are some common reasons why your CGM readings might be acting weird.
1. Compression lows- Sleeping or leaning on the sensor can cause false lows, especially overnight.
2. First 24 hours of a new sensor- Readings can sometimes be less accurate while the sensor settles in.
3. Rapid glucose changes- CGMs measure glucose in interstitial fluid, so there can be a delay during fast rises or drops.
4. Sensor placement issues- Areas with little fat, lots of movement, or constant knocks can affect readings.
5. Heat, sweat & dehydration- Hot weather , sports, sweating or dehydration can sometimes impact performance.
6. Loose adhesive or partially lifted sensor- Even slightly lifting can cause signal or accuracy problems.
7. Bluetooth/ signal interruptions- Phones too far away, low battery, or app glitches can temporarily affect updates.
8. End of sensor wobble- Some sensors get less reliable in the final 12-24 hours before expiry.
9. Illness or inflammation- Being unwell can sometimes create more unpredictable readings.
10. It might actually be correct- Sometimes symptoms lag behind glucose changes, always double check if unsure.
If readings don't match symptoms, trust how you feel and confirm with a finger prick when needed.
Full guide + practical tips on T1D Wave Rider