The most typical symptoms of diabetes are “three more and one less”, i.e. eating more, drinking more, urinating more and losing weight in a short time. When these symptoms appear, it is usually related to diabetes, and then combined with the blood sugar, if the blood sugar is high, then it is undoubtedly diabetes. Diabetes has been called “the cancer that won’t die”, which is a clear indication of its severity. And diabetes is lifelong incurable, can only rely on medication to maintain the treatment, and in life, diet, there are many taboos, can not be violated, which has a great impact on the normal life and work. However, there is nothing medical science can do about it. As long as the control of symptoms, does not affect the normal life is appropriate. When it comes to the symptoms of diabetes, it is the same as other diseases, in the early stage of the general asymptomatic, or symptoms are not obvious. Normal physical examination, there can be a rise in fasting blood glucose, but can not be the only criterion, can be combined with the postprandial blood glucose is elevated to be judged, early diabetes, part of the patients manifested as postprandial blood glucose, and glycated hemoglobin elevated situation. Glucose tolerance test can be carried out, taking glucose two hours later, if the blood glucose is still greater than 11.1mmol / l or more, it can be diagnosed that this patient is a diabetic. With the development of the disease, diabetic symptoms will gradually increase, or even aggravated, its specific performance as: First, “three more and one less” more drinking, eating, urinating, weight loss, which is the most common symptom, most commonly seen in type 1 diabetes mellitus; Second, the body fatigue and weakness, dizziness, obesity, sweating and other symptoms, which is most often seen in type 2 diabetes mellitus; Third, the complications of diabetes mellitus: the body fatigue and weakness, dizziness, obesity, sweat and other symptoms, which is mostly seen in type 2 diabetes mellitus ; iii. Diabetes complications: long-term elevated blood glucose may lead to microvascular and nerve damage, such as fundopathy, hypertension, diabetic nephropathy, diabetic foot and diabetic peripheral neuropathy. This is the most serious problem of diabetes mellitus, and even affects the quality of life as a result. As you can see, among the symptoms of type 2 diabetes, there are symptoms of dizziness and weakness in the limbs and easy sweating.