Drinking ice water for cardiac discomfort may be related to cold stimulation of the vagus nerve. Acute cold stimulation can activate the vagus nerve, causing a decrease in heart rate, further reducing the heart’s work, reducing myocardial oxygen consumption, thereby relieving cardiac discomfort, for the existence of cardiac underlying disease patients, acute cold stimulation can be a short period of time to alleviate the symptoms of cardiac discomfort. There are also some patients with cardiac neurosis, there is a certain psychological implication that drinking ice water can make the heart uncomfortable symptoms, the specific mechanism is unknown. If symptoms of cardiac discomfort occur, it is recommended to seek medical treatment as soon as possible, only through simple self-treatment can not achieve effective therapeutic effects, need to be under the guidance of a professional doctor to carry out systematic and rational treatment.