Strictly speaking, people with diabetes are just like ordinary people, the characteristics of the disease are not necessarily written on someone’s face and cannot be distinguished by physical features alone. If we adjust our thinking and look at it from a different perspective, then this question gives the meaning of a health alert. Let’s think about it this way: What discomforts or phenomena in my body indicate that my blood sugar may be elevated or that I have diabetes? What are the symptoms or discomforts that indicate diabetes? How can I find out what these symptoms are and how can I find out what they are by following the path from the surface to the inside? Generally speaking, the symptoms of diabetes are divided into two aspects: 1) the “three more and one less” symptoms brought about by the elevated blood sugar itself, i.e., excessive urination, excessive drinking, excessive eating, weight loss, serious nausea and vomiting, and even coma; 2) the chronic complications brought about by the long-term elevated blood sugar (in years), which affect all corners of the body, and no part of the body is spared. This is the most insidious of diabetes, which gradually penetrates unknowingly and is an invisible killer that hurts you. For example, vascular lesions that nourish the nerves can cause numbness, swelling and tingling at the ends of the fingers and toes, and in severe cases, sleepless nights, tears and pain. When the kidneys are damaged, protein, an important nutrient in the body, is leaked from the kidneys and excreted in the urine, followed by swelling of the face and lower limbs, and later progresses to uremia, which is life-threatening. Eye lesions can lead to vision loss or blindness, or worse, ischemic stroke, myocardial infarction, and foot ulceration. Due to the decline in resistance, it is easy to combine various infections, such as urinary tract infections, pneumonia, minor epidermal damage that is difficult to cure. Therefore, where there are “three more and one less”, limb numbness, proteinuria, swelling, repeated unexplained infections, trauma is not easy to heal, stroke, myocardial infarction, foot ulcers and any other conditions should be highly alert, they may have been staged on the rich disease of diabetes. However, the number of people with the typical “three more and one less” symptoms is very small, and other manifestations are not unique to diabetes, so we also need to expand our clinical thinking, through other possible ways to identify diabetes as early as possible for early diagnosis and treatment, to control the disease in the bud. For example, we can also look for diabetes through the “interpersonal” aspects of diabetes. As we all know, diabetes is particularly well liked. Wherever you go, you will always be surrounded by a group of brothers, including obesity, hypertension, hyperlipidemia, and hyperuricemia, who share the same problems and follow each other. Therefore, as long as the presence of one of the brothers, then most of the other brothers also sooner or later to its vicinity, to do everything possible to find them out to guard, if they are allowed to get away, continue to lurk in the body for many hours will be endless, is not found in the short term temporarily do not stop there, to pursue the end, regular health checkups is the best policy. In a word, the “difficult brother looking for difficult brother” approach is a tip to find the clues of diabetes, because diabetes is often hidden among other diseases, through such a way to look at the color, you can “pull out the carrot to bring out the mud”, and finally identify it. In short, as long as this firewall is always installed inside, you will not worry about your health.