Why does my heart rate increase suddenly, for example, when I hear a slight sound or start working?
Your heart rate increases suddenly in situations such as hearing a slight sound or starting work, as part of a normal ?fight or flight? response triggered by adrenaline, which temporarily speeds up your heart rate. If it happens frequently or is accompanied by dizziness, chest pain, or shortness of breath, please consult your doctor to rule out heart rhythm problems or other underlying issues.