Impaired glucose tolerance may be characterized by non-specific symptoms such as fatigue, drowsiness, mental depression, etc. Some patients have no obvious symptoms and need to rely on fasting blood glucose, glucose tolerance test and other related tests to confirm the diagnosis. Impaired glucose tolerance usually belongs to the pre-diabetic stage, most of them have an insidious onset, often occurring in the obese population, due to the body’s impaired metabolism of glucose can not be fully converted into energy, so it may be manifested as fatigue, drowsiness, mental depression and other non-specific symptoms. Diagnosis can be confirmed through relevant tests such as fasting blood glucose, glucose tolerance test and glycosylated hemoglobin. After the diagnosis of impaired glucose tolerance is confirmed, the patient should actively control glucose through dietary therapy and exercise therapy, and take hypoglycemic drugs as prescribed by the doctor if necessary to avoid the progression of the disease to diabetes mellitus. Impaired glucose tolerance should be treated promptly by a doctor.