Your heart rate depends on many factors. If you are a smoker, your heart rate may go up after smoking a cigarette and stay elevated for approximately 30 minutes. Also some medications can elevate your heart rate. Other causes include caffeine or activity. Right after you eat your heart rate may speed up.
Some people live their entire lives with a pulse that is faster than normal.
A normal heart rate is anywhere between 60 and 100, depending on what you've been doing and other factors discussed. A heart rate consistently faster than 100 is worth evaluating for potential heart or thyroid problems but is not an emergency situation. Continue to monitor your heart rate and notify your doctor if it reaches 100 or faster on a regular basis when you are resting. Check the calendar.