The diagnosis of diabetes mellitus relies heavily on blood glucose values, so misdiagnosis is unlikely, but it is easy to miss the diagnosis, especially in young people who may not be aware of the need to test their blood glucose. type 1 diabetes mellitus patients often present to the doctor with acute complications of diabetes mellitus, such as diabetic ketoacidosis or diabetic hyperosmolar coma. When young people go to the clinic in a comatose state or with abdominal pain or fever, the diagnosis is often easily missed, so basic blood glucose testing is still very important for any patient with symptoms. Blood glucose testing for cerebrovascular disease and cardiovascular disease are included in the routine treatment. For young people, we should strictly inquire about family history and ask patients about their current conditions and then regularly self-test blood glucose. For patients with other diseases, blood glucose testing after consultation is also very critical. Therefore, if you have the symptoms of diabetes to test blood glucose, and if you do not have the symptoms of diabetes, but you visit the doctor with other diseases, you should also consider the possibility of complications of diabetes, and you should also test blood glucose in order to detect and treat diabetes in time, and prevent the delay of treatment.