If a rapid heartbeat occurs in the lying position, this condition is considered to be due to one’s own sensory abnormality. In the lying position, the part of the heart is close to the chest wall, and the patient may feel that the heartbeat is more obvious, and if in a quiet state, the obvious heartbeat will make the patient feel that his/her own heartbeat is fast and too loud. It is mainly seen in young, thin patients, and is very easy to be common in a quiet state, without excessive worry. However, there is a case of fast heartbeat due to positional changes, but this kind of positional changes in the fast heartbeat, most of the time when standing, and lying down will gradually drop to normal. Therefore, if the patient simply has this symptom, regular observation is sufficient, and there is no need to be overly nervous about his or her heartbeat.