The early symptoms of untreated diabetes are related to elevated blood sugar levels, and loss of glucose in the urine. High amounts of glucose in the urine can cause increased urine output and lead to dehydration. Dehydration causes increased thirst and water consumption.
The inability of insulin to perform normally has effects on protein, fat and carbohydrate metabolism. Insulin is an anabolic hormone, that is, one that encourages storage of fat and protein.
A relative or absolute insulin deficiency eventually leads to weight loss despite an increase in appetite.
Some untreated diabetes patients also complain of fatigue, nausea and vomiting.
Patients with diabetes are prone to developing infections of the bladder, skin, and vaginal areas.