Drinking shortness of breath may be physiological reasons, alcohol allergy, heart disease caused. 1. Physiological reasons: after drinking alcohol, the main component of alcohol is ethanol, ethanol into the body can generate acetaldehyde, acetaldehyde can make the capillaries expand rapidly, expanding the capillaries at the same time caused by the sympathetic nerve excitability, stimulate the sympathetic nerve to release dopamine, caused by the increase in myocardial contraction, the patient’s heartbeat accelerated at the same time may be accompanied by tightness in the chest, shortness of breath symptoms. 2. Alcohol allergy: some patients have an allergic reaction to alcohol, resulting in bronchoconstriction or laryngeal edema, and shortness of breath symptoms may occur when the respiratory airflow is obstructed. 3. Heart disease: patients with cardiac insufficiency, drinking too much alcohol will increase the burden on the heart, resulting in shortness of breath symptoms. If you often have shortness of breath after drinking alcohol, it is recommended to reduce the consumption of alcohol and seek timely medical treatment if there is any abnormality.