Untreated diabetes can also lead to hyperosmolar hyperglycemic nonketotic syndrome (HHNS), which causes a severe and persistent increase in blood sugar levels. An illness or infection will usually trigger HHNS, which can require hospitalisation. This sudden complication tends to affect older people.
Keeping blood sugar levels under control is crucial for preventing some of these complications.
The longer that blood sugar levels remain uncontrolled, the higher the risk of other health problems.
According to the NHS, you should contact your GP immediately if you experience symptoms of type 2 diabetes.