Glucose tolerance is also known as oral glucose tolerance test, do glucose tolerance nausea after drinking sugar water does not indicate high blood sugar. Nausea after drinking sugar water is mainly caused by the body’s inability to adapt to the high concentration of sugar water. The high concentration of sugar water osmotic pressure is high, the gastrointestinal tract has a certain stimulating effect, may lead to excessive secretion of gastric acid, so part of the population after drinking sugar water may appear nausea, abdominal discomfort and so on, belongs to a normal phenomenon, and the high and low levels of blood sugar has no direct connection. Glucose tolerance test is a test used to detect the body’s ability to regulate the sugar load and is generally used to help diagnose diabetes. Glucose tolerance test should be performed under the guidance of a medical professional and the doctor should be informed promptly if any discomfort occurs.