Palpitations are considered a disease term in Chinese medicine, while atrial fibrillation is a medical term in Western medicine. Generally, if there is a correlation between Chinese and Western medical terminology, palpitations can correspond to atrial fibrillation, but not all cases of palpitations are atrial fibrillation. In Chinese medicine, palpitations refer to a subjective feeling of unease or discomfort in the chest, and a feeling of irregular heartbeats. For example, some people may feel their heartbeat distinctly even when their heart rate is not fast, especially when their blood pressure is high; this is also considered palpitations. Additionally, some people may experience a rapid "thumping" heart rate after physical exertion or when they have a fever, which is also a manifestation of palpitations. There are also healthy, sensitive young individuals who can feel their heartbeat while lying down quietly or during sleep, which is also classified as palpitations. However, palpitations that are caused by heart arrhythmias, like atrial fibrillation, where individuals can feel their heart beating rapidly and experience anxiety, are specifically indicative of atrial fibrillation; other types are not considered the same.