There are about two kinds of diabetes in TCM:
Yin Deficiency & Blood Heat Diabetes: If Yin in the body is deficient, Yin can’t restrict Yang, just like no water and fire will be in hyperfunction, so the people will appear syndrome: Unexplained weight loss, Excessive thirst, Excessive urination, Excessive eating possible together with dry mouth and throat, dizziness, insomnia, palpitation, feverish sensation in the centers(palms, soles and chest) , tidal fever, flushed cheeks, night sweating, constipation, deep reddish tongue with scanty fur and thin and fast pulse etc.
It is blood heat affects insulin secretion, and also glucose application of organs, tissues and cells, that is why blood glucose and urine glucose higher than normal, and in this kind of diabetes blood glucose and urine glucose are obviously higher. Though the index of blood glucose and urine glucose is high, it is only relative, in fact the body is in shortage of glucose absolutely, the body needs glucose to offer energy, because 80% energy of body from glucose, 20% from proteins and fat, and at last Multiple System Organ Failure develops because of lack of energy.