心悸（英语：Palpitation）是一种可感觉到自己的心脏跳动的不适现象,有时伴有眩晕和呼吸困难。心悸可在正常人的健康心脏中发生，因此常常被认为是一种正常现象。然而，它也有可能是某种严重疾病的表现，如冠心病，哮喘和肺气肿。心悸时，心跳可能过快、过慢、不规则、或是以正常速度跳动。心悸的可能成因有过度用力、压力、焦虑、恐慌，肾上腺素、尼古丁、可卡因、酒精、疾病（例如甲状腺功能亢进）、药物（如咖啡因等兴奋剂）使用。心悸也是恐慌症或僧帽瓣狭窄的症状之一。

几乎每个人都有过心跳不正常的经验，但当这种现象太经常发生时，就有可能意谓着身体某部位的不正常。心悸可能与心脏疾病、贫血或甲状腺异常有关联。

Palpitation is a perceived abnormality of the heartbeat characterized by awareness of heart muscle contractions in the chest: hard beats, fast beats, irregular beats, and/or pauses. It is both a symptom reported by the patient and a medical diagnosis. Palpitation is frequently associated with anxiety and does not necessarily indicate a structural or functional abnormality of the heart, but it can be a symptom arising from an objectively rapid or irregular heartbeat. Palpitation can be intermittent and of variable frequency and duration, or continuous. Associated symptoms include dizziness, shortness of breath, sweating, headaches, and chest pain.