High heart rate. Mildly underweight. Slightly active.

[Abloomingrose]

So my resting heart rate is around 70 but 5+ hours a day it's in "fat burn" zone. It stays 90-120 most of the day. I am only active while at work and sit around at home the rest of the day. I dont know why my heart rate is so high. I drink caffeine, as I work at Starbucks, and I usually try to eat when I drink coffee. I'm slightly underweight as I'm 4'11 and my weight fluctuates between 85 and 92. Weight should be 90-95.

Any ideas why my bpm is high?

[Heather-S · Accepted solution]

You should really visit your doctor if you have concerns.

Try taking your heart rate manually to make sure your device is working properly. 

But definitely seek professional medical advice if you have a concern.