When your heart races while you're physically calm, it's often your nervous system responding to internal stress or anxiety. Your brain might perceive a threat that isn't physical, triggering your heart to pump faster in preparation for action. This can also be caused by caffeine, dehydration, lack of sleep, or underlying anxiety disorders. If this happens frequently, it's worth discussing with a healthcare provider to rule out any medical causes and learn coping strategies.
Anxiety & Stress
Why does my heart race even when I'm just sitting still?
A racing heart at rest can be caused by anxiety, stress, caffeine, or your body's heightened alert state responding to perceived threats.