Eat more cold things in summer. Even iced food and drinks. Too many cold drinks will not only dilute gastric juice, but also stimulate gastric mucosa. Often drinking cold drinks will affect appetite and digestion, and will also cause local vasoconstriction due to excessive stimulation of gastrointestinal mucosa, leading to gastrointestinal ischemia, hypoxia and gastrointestinal dysfunction. If primary chronic gastritis or gastric cancer or duodenal ulcer, it is likely to cause acute attack, especially after eating cold drinks containing gas, which may lead to massive bleeding of gastric cancer and duodenal perforation, which is life-threatening. In addition, in patients with hypertension, coronary heart disease, cerebral arteriosclerosis and myocardial infarction, cold stimulation in summer will cause vasospasm, increase blood pressure and aggravate the condition. If the biliary tract is cold again, it will produce convulsions, so in hot weather, people who are too greedy for cold will relapse for patients with cholecystitis and gallstones.