A resting heart rate of 100–120 bpm is considered elevated and may indicate a condition called tachycardia, where the heart beats faster than normal while at rest. This can be caused by stress, illness, dehydration, anxiety, or underlying heart problems. While a heart rate in this range might be expected during or after exercise, it should not persist during rest. Regularly resting in this range may lead to unnecessary strain on your heart and long-term cardiovascular complications. The healthy adult range at rest is 60–100 bpm, and consistent readings above this should prompt a check-in with a medical provider to rule out potential health issues or lifestyle factors contributing to elevated heart rate.