Drinking a small amount of ice water at a time will not cause obvious harm to the body, while drinking a large amount of ice water will mainly cause dentin allergy and affect digestion. In addition, drinking a lot of ice water for a long time may also affect the reproductive system or make people easy to catch a cold. For elderly patients, drinking too much ice water is easy to induce angina pectoris.

1, dentin hypersensitivity: drinking ice water will stimulate teeth nerves, causing tooth pain and sensitivity, which will take some time to disappear, but sensitive symptoms will generally recover quickly;

2, affecting digestion: a large number of ice-water drinks will stimulate the digestive tract, enter the stomach and strongly contract small blood vessels, which is easy to cause gastrointestinal cramps and affect normal digestive function. In addition, the function of digestive enzymes needs a suitable temperature. Ice water will drastically reduce the temperature of digestive tract and the activity of digestive enzymes in the stomach. The undigested food will enter the intestine, which may lead to diarrhea.

3, reproductive system impact: ice water entering women's intestines will cause uterine smooth muscle spasm, and long-term drinking ice water will also lead to dysmenorrhea. Long-term dysmenorrhea can cause menstrual disorder and affect women's reproductive health;

4, easy to catch a cold: drinking cold ice water will stimulate the contraction of small blood vessels in the respiratory tract, which will seriously cause wind-heat colds;

5, induced angina pectoris: drinking a lot of ice water leads to vasoconstriction, gastrointestinal nerve regulation leads to vasoconstriction, and cardiac blood vessels contract due to ice water, which is easy to induce angina pectoris.