As the incidence of diabetes increases year by year, the number of diabetic patients is rapidly increasing. In the face of the massive influx of diabetic patients, there is an obvious shortage of professionals in diabetes prevention and treatment, and patient education is far from the actual needs. Under such circumstances, unscrupulous vendors take advantage of the opportunity to peddle fake and inferior drugs, and many patients are treated irregularly and listen to misinformation. There are also many patients with their own feelings on their own medication, resulting in irreparable damage, here combined with real cases to talk about patients with their own feelings on the medication is very undesirable, and even very dangerous. Case 1, Lao Liu (to protect the patient’s privacy, omitted the real name, the same below), 71 years old, type 2 diabetes history of sixteen years, ten years ago due to the occurrence of “cerebral infarction”, poor glycemic control, began to inject their own medium-acting insulin (NPH insulin), injection dose according to their own feelings arbitrary increase or decrease, the dose before admission: 26 units before breakfast, 30 units before dinner. 26 units before breakfast and 30 units before dinner. His blood sugar was rarely tested, and he reported frequent “hypoglycemia” and unresponsiveness in the past two years. After admission, he had multiple lacunar cerebral infarcts, urine protein 2+-3+, diabetic retinopathy stage III, hypertension grade 3, and enlarged left ventricle. Fasting blood glucose was 2.1-3.5 mmol/l, two hours after meals and at bedtime blood glucose was 18-26 mmol/l. After obtaining the patient’s consent, insulin pump treatment was given. After several adjustments, the total daily amount of insulin (Novalax) was reduced to 18 units, and the fasting blood glucose was 5.8-7.3 mmol/l, and the blood glucose two hours after meals and at bedtime was 8.1-10.0 mmol/l. This patient did not inject insulin under the guidance of a specialist, but chose it at random “by feeling”. This condition lasted for ten years and caused significant damage to the heart, brain, kidney and fundus of the eyes. In particular, the large fluctuations of blood sugar accelerated the occurrence and development of complications. The repeated hypoglycemia caused serious damage to the central nervous system, which was irreversible, and together with the patient’s recurrent cerebral infarction, made him unresponsive and unable to take care of himself. The daily insulin dosage at the time of discharge was 38 units less than that before admission, which of course was related to the type of insulin and the use of insulin pump, but also reflected the extremely unreasonable use of insulin before admission. Lao Liu was discharged safely under the treatment of the specialist, but compared with him, the following two patients were not so lucky. Case 2, Lao Li, 55 years old, a Chinese medicine practitioner with eight years of diabetes, prepared Chinese medicine for himself from the day he was diagnosed with diabetes, and as a Chinese medicine practitioner, he was so confident that he could control his condition with Chinese medicine that he rarely tested his blood sugar and did not see a specialist. The actual fact is that you can find a lot of people who are not able to get a lot of money for the money. It was not until the unit physical examination revealed clear kidney complications and fundus lesions that Lao Li woke up from his dream, but unfortunately he did not take active measures to control his condition, but left a suicide note and went to another world. Old Li’s experience left us with too many regrets and reminded us that we must trust science in the treatment of diabetes and standardize treatment under the guidance of a specialist, not blindly confident “by feeling”, and not to some unverified “prescription”. We should not have illusions about unproven “prescriptions”. Chinese medicine is great, but the application of traditional Chinese medicine should not exclude the modern medical system, the combination of the two is the best model. Case 3: Old Wang, 67 years old, with a history of diabetes for 12 years. After his diagnosis of diabetes twelve years ago, he has been taking “thirst pills”, “sugar pills” and “propolis” at pharmacies, and the dosage has been increased or decreased at will according to his symptoms. He rarely tests his blood sugar. In the past two years, he came to the hospital with weakness, swelling of lower limbs, blurred vision, palpitations and shortness of breath, and was diagnosed with diabetes combined with retinopathy stage IV, cardiac insufficiency and renal failure (azotemia stage). Old Wang believed that insulin injection would be “addictive” and resolutely refused to inject insulin and continued to take the above mentioned drugs. Six months ago, Wang’s right toe ulcerated, blood sugar 18-25mmol/l, and soon formed gangrene, and spread to the whole foot and lower leg, accompanied by high fever. He was reluctantly persuaded by his family to receive insulin injections, at which time the doctor recommended amputation to avoid life-threatening, but Lao Wang resolutely refused, repeated persuasion was ineffective, and finally despite the hospital’s active anti-inflammatory, Lao Wang still left this world due to sepsis. The lessons we can learn from Lao Wang: first, long-term self-purchase of drugs, “by the feeling” to adjust their own medication, and rarely monitor blood sugar. He took the “thirst pills”, “sugar flat” generally should not be taken together (thirst pills contain glibenclamide, and sugar flat belong to the same sulfonylurea drugs), and “propolis” is only a health product, not a therapeutic drug; secondly, the “propolis” is not a therapeutic drug. Secondly, refusal of insulin injection after the development of heart, brain, kidney and eye complications makes the complications not be effectively controlled. Finally, on the issue of amputation to save his life, Wang was stubborn and left with regret. The above three cases are representative, and the common feature is that they all believe in their own “feelings” and misunderstand that “it is better to seek medical help than to seek help from oneself”. The treatment of diabetes emphasizes standardized treatment and comprehensive treatment under the guidance of professionals, and not “following the feeling”.