7 Your thyroid is under-or over-dynamic
Your thyroid—the butterfly-formed organ in your neck—produces chemicals that help your body work effectively. In case it’s not making enough, it implies you have hypothyroidism, which could cause your pulse to be low, says Taub.
Then again, in case it’s overperforming and siphoning out additional chemicals, you have hyperthyroidism, which can raise your pulse. Your PCP can test your thyroid capacity with a blood test.