Fasting blood glucose suddenly rises 7.1mmol/L around 5mmol/L, which may be related to many factors such as dawn phenomenon, acute stress, medication, emotional fluctuations, etc. It is recommended to observe and monitor the postprandial blood glucose data first, and medication can be used to control the blood glucose if necessary. 1. Observation: the normal value of fasting blood glucose is between 3.9~6.1mmol/L. If the fasting blood glucose suddenly rises 7.1mmol/L around 5mmol/L, which is equal to the blood glucose going from normal to abnormal suddenly, abnormal causes may be considered, and you can observe for a period of time to see whether the fasting blood glucose data fall back to the normal range. 2. Monitoring postprandial blood glucose: fasting blood glucose 5mmol / L about 7.1mmol / L after a sudden rise, but also need to monitor the blood glucose data two hours after the meal, to see whether the postprandial blood glucose fluctuations. 3. Drug control: fasting blood glucose in 5mmol / L about a sudden rise of 7.1mmol / L to determine belong to the phenomenon of high blood sugar, if you consider diabetes, you can through metformin and other drugs to lower blood sugar. The use of medication should be guided by a doctor. Encounter fasting blood glucose in about 5mmol / L suddenly rose 7.1mmol / L situation, we recommend that patients go to the regular hospital in a timely manner.