Drinking a small amount of ice water at a time does not cause significant harm to the body, but drinking large amounts of ice water can be harmful to the body mainly by making teeth sensitive, affecting digestion and so on. In addition, long-term drinking large amounts of ice water may also affect the reproductive system or make people easy to catch a cold. For elderly patients, drinking too much ice water can easily induce angina. 1, tooth sensitivity: drinking ice water will stimulate the dental nerve, resulting in tooth pain and sensitivity, need to relieve a period of time to disappear, but sensitive symptoms generally recover quickly; 2, affect digestion: a large amount of ice water drinking will stimulate the digestive tract, into the stomach to strongly constrict small blood vessels, easily caused by intestinal spasm, affecting normal digestive function. In addition, the role of digestive enzymes need the right temperature, ice water will make the digestive tract temperature drops sharply, digestive enzyme activity in the gastrointestinal tract is reduced, not thoroughly digested food into the intestines, can lead to diarrhea; 3, reproductive system impact: ice water into the female intestine will cause uterine smooth muscle spasm, long-term drinking ice water will also lead to dysmenorrhea, long-term dysmenorrhea can cause menstrual disorders, affecting women’s reproductive health; 4. Easy to catch a cold: drinking cold ice water can stimulate small vasoconstriction of the respiratory tract, which can cause a serious wind-heat cold; 5, induced angina: drinking large amounts of ice water leads to vasoconstriction, as well as gastrointestinal nerve regulation leads to vasoconstriction, cardiac vascular contracture due to ice water, easily induced angina.