The heart suddenly thumps when staying up late is probably due to preterm contraction, which is often referred to as premature beats. The prolonged sympathetic excitement may cause the heart’s conduction system to react abnormally, and the heart muscle cells may conduct electrical signals irregularly, thus beating when they should not, and the human body will feel the heart suddenly thumping. This condition is usually divided into functional premature beats and pathological premature beats, which have different effects on the body and need to be treated differently. In addition, other cardiovascular diseases may also occur. 1. Functional premature beats: If there are no other pathological conditions in your heart, but your heart suddenly thumps when you stay up late, it is usually a functional premature beat. It is recommended to go to the hospital for ECG examination in time. If the time is too short, it is better to wear a Holter to monitor the cause, and pay attention not to stay up late anymore, as functional premature beats may gradually change into pathological premature beats due to long-term staying up late. Whether there is the possibility of sudden cardiac death. Such patients may have frequent premature beats, and they are not only limited to staying up late, but may even have other reactions such as dizziness, coma and chest pain, which need to be noticed. Frequent premature beats will likely interfere with the normal function of the heart, the heartbeat is too fast, making the chances of sudden death higher, this should not continue to stay up late, and timely diagnosis and treatment at the hospital. Second, other cardiovascular diseases such as atrial fibrillation, ventricular tachycardia or myocardial ischemia and other cardiovascular diseases, can also appear when staying up late with a sudden heart thump, accompanied by panic, chest tightness, chest pain, etc., some people can also appear blackout, syncope, etc., at this time should be timely medical treatment. In addition, often stay up late can lead to heart problems, but also may cause the body overworked, affecting the function of other systems, so you should pay attention to regular work and rest, maintain a good lifestyle, so as not to aggravate the symptoms of disease and threaten life.