What causes palpitations after drinking alcohol?
May 18, 2022
Source: Cainiu Health
Dr. Zhao Haiming
Introduction
Panic after drinking alcohol is most likely due to the effects of alcohol itself. Upon consumption, alcohol acts on the sympathetic nervous system, enhancing myocardial contractility and elevating blood pressure. Although heart rate may reflexively increase, patients with excessively rapid heart rates may experience palpitations. Moreover, alcohol not only stimulates the nervous system but also increases the intrinsic excitability of the heart.
Alcohol’s primary chemical component is ethanol. Alcoholic beverages typically contain trace amounts of other alcohols and esters. The alcohol concentration in Chinese baijiu (distilled spirits) commonly reaches 60% ABV (alcohol by volume). So, why does palpitation occur after drinking?
Why does palpitation occur after drinking?
Palpitations following alcohol consumption are most likely attributable to the effects of ethanol. Upon ingestion, alcohol stimulates the sympathetic nervous system, enhancing myocardial contractility and elevating blood pressure. Although heart rate may reflexively increase, individuals with excessively rapid heart rates often experience palpitations. Moreover, alcohol not only excites the central nervous system but also directly increases cardiac excitability. Consequently, alcohol consumption can trigger various forms of tachyarrhythmias—including atrial fibrillation, ventricular premature contractions, atrial premature contractions, and supraventricular tachycardia—thereby predisposing individuals to palpitations and anxiety-like symptoms.
Thus, alcohol imposes numerous adverse effects on the heart. Excessive alcohol intake must therefore be avoided. While moderate alcohol consumption is currently not strictly contraindicated, daily intake should not exceed 20 g of pure ethanol. Based on the alcohol content of the beverage consumed, this translates roughly to one or two standard drinks per occasion—staying within this limit helps prevent associated health complications.
Alcohol consumption may also precipitate acute myocardial infarction—a potentially life-threatening condition—so excessive drinking should be rigorously avoided. We hope this information proves helpful!
