Could you tell me what happens if diabetes is undiagnosed?

Could be dangerous: If type 1 diabetes is not diagnosed severe dehydration and acid build up occurs that could lead to death. Type 2 diabetes does not lead to such severe dehydration if untreated, but will cause frequent urination, infections, blurred vision and tiredness. Long-term untreated diabetes can cause kidney failure, heart attacks, blindness, nerve pain, numbness, weakness, foot ulcers and amputation.