Heart palpitations are often described as a feeling that your heart is racing, pounding, or fluttering. They can occur during physical activity or at rest and may last for a few seconds or longer. While they can be alarming, most palpitations are not serious and can be attributed to factors such as stress, anxiety, caffeine intake, or hormonal changes. However, if they occur frequently or are accompanied by other symptoms, it is important to consult a healthcare professional to rule out any underlying conditions.