This morning an old patient of mine called and said in a hurry, “Dr. Yu, I found an important situation! I measured the blood sugar of three fingers are different! To be honest, this is really the first time I encountered such a thing, I asked for details to know, this patient first checked the ring finger, blood sugar is 7.5, then he suddenly thought, and then test the middle finger how, the results scared him, 15! This situation really overwhelmed him. Analyzing this process carefully, of course, we cannot completely exclude the problem of blood glucose meter error, but the most important thing is how to look at the problem of blood glucose value. We believe that there are very many factors affecting blood glucose, such as emotions, testing time, eating, drinking, labor, medication and so on and so forth. Among them, the stress factor has the greatest influence on blood sugar. The so-called stress is the physiological reaction of the human body to the sudden external events, and the most important expression is the increase of blood sugar. The first blood glucose of this patient should be the normal reflection of the usual, the second blood glucose I think there are error factors, the third blood glucose has the influence of stress factors such as worry and anxiety. Because there are many factors affecting blood glucose, we often say that the analysis of blood glucose test results should look at the trend, not the point. If the recent blood glucose trend is downward gradually close to normal, we consider that the control is in the good direction. If the blood glucose trend is gradually deviating upward from the normal blood glucose level, we consider the blood glucose control to be poor. There are certainly ups and downs and fluctuations in between, but as long as it is not a big swing between low and too high blood sugar, we can consider the trend to be valid. At that point the means of blood sugar control can be maintained or improved accordingly. Doesn’t that sound like a similarity between the fluctuations of stocks and the means of manipulation? That’s right. This patient is usually very hard on himself, follows his treatment plan very strictly, and has a cautious personality. That’s a good thing – at least it’s better than patients who don’t care. But excessive nervousness and caution can also be a factor in glycemic control. When you see a high, you get nervous, and when you see a low or normal, you wonder if the results are correct, and then it’s the numbers that affect the patient’s glycemic control. So I finally advised this patient’s old friend to stop doing such things. With little knowledge of blood glucose, blindly operating and analyzing the results can only disturb their emotions, which is even more detrimental to blood glucose control.