The early detection and prevention of diabetes is an important factor in the effective containment of diabetes. How to detect diabetes early should first be understood from the following aspects. 1.Who are vulnerable to diabetes? People with a family history of diabetes, middle-aged and elderly people, obese people, people with high blood pressure, and people with high blood cholesterol are all susceptible to diabetes. People with these conditions should have regular checkups at the hospital for early detection of diabetes. Diabetes does not necessarily have the typical symptoms of “three more, one less”, especially type 2 diabetes, so the following conditions should also be suspected. ① Family history of diabetes. People with a clear family history of diabetes have a high probability of developing type 2 diabetes and should be aware of it. ② A history of abnormal childbirth. For example, a history of unexplained multiple miscarriages, stillbirths, stillbirths, premature births, malformed or large babies, or elevated blood sugar during pregnancy. ③ Recurrent infections. Those with persistent vulvar itching, or recurrent vulvar or vaginal mycotic infections, or repeated sores and canker sores, may be diabetic patients. Many female patients are found to be diabetic by visiting the gynecologist for vulvar itching. ④ Impotence. Male patients with impotence should be suspected of having diabetes mellitus after localized lesions in the genitourinary tract have been excluded. ⑤ There is polyuria, thirst, and excessive drinking, or there is recent unexplained weight loss. (6) Occasional positive urine glucose with normal fasting glucose should also be suspected of diabetes mellitus, and further examination should be performed. (7) Reactive hypoglycemia. It mostly occurs 3 hours or more after meal, manifested as panic, hunger, sweating, trembling, etc. Blood glucose may be at or below normal low value, and may be present in some obese early stage of type 2 diabetes. (8) Young patients with arteriosclerosis, coronary artery disease, and fundus lesions should be suspected of having diabetes. If the above conditions occur, you should seek medical examination in time. 3. Atypical symptoms of diabetes More than 80% of diabetic patients do not have the typical symptoms of “three more and one less”, such as drinking more, eating more, urinating more and losing weight. Therefore, for people who are suspected of having diabetes, such as obesity, hyperlipidemia, hypertension, pruritus, untreated ulcers, normal diet without any discomfort, weight loss, frequent weakness, occasional hypoglycemic reactions, loss of vision, impotence, wounds that do not heal easily, gastrointestinal discomfort such as alternating diarrhea and constipation, vomiting, etc., they should go to the hospital for blood glucose examination to avoid delaying the disease.