When the weather is hot or indoor air is not smooth the cardiovascular vessels will be filled, the nerves will also be restless, so when the body feels hot cardiovascular expansion blood filling, and then produce symptoms of panic, palpitations, some patients will also have sweating, irritability, thirst, and even coma and other water-electrolyte disorders, this time need to immediately find a relatively cool and ventilated place, slowly sit down or lie down to rest. At the same time, drink cool plain water instead of ice water, so as not to reflexively cause heart failure, and give electrolyte supplementation if necessary. Also related to heart disease, patients with arrhythmia or coronary artery disease, when the weather is hot, it will trigger sympathetic excitation, and then produce the symptoms of heartburn.