Write the next sentence in this paragraph:

How to treat hyperthyroidism 
Look for a change in heartbeat. 
Because the hormone affects your heart rate, you can have a faster heartbeat, an irregular heartbeat, or a pounding heartbeat due to hyperthyroidism. You'll usually feel an irregular or pounding heartbeat, but you can check to see if your pulse is 100 bpm or more.
To check your heart rate, find your pulse. Use a stopwatch to time 15 seconds while counting beats.