Also known as high blood sugar. It occurs when blood glucose levels rise above 10 mmol/l, and the body does not have enough or cannot use insulin to process food. Symptoms of hyperglycaemia include nausea, vomiting, muscle and joint aches, blurred vision, excessive thirst, and frequent urination. Over time, weight loss can result. Hyperglycaemia can occur even while using an insulin pump, and can lead to diabetic ketoacidosis (DKA) if untreated.