Resting heart rate is a crucial indicator of cardiovascular health, reflecting the number of heartbeats per minute when the body is at rest. Typically, a normal resting heart rate for adults ranges between 60 and 100 beats per minute. However, there are instances when the resting heart rate may spike, especially during illness. In this article, we will delve into the phenomenon of a resting heart rate of 120 when sick, exploring the potential causes, implications, and the importance of monitoring heart health during periods of illness.