What symptom is commonly associated with hyperglycaemia?

Blurred vision is a commonly associated symptom of hyperglycaemia, which is a condition characterized by elevated blood glucose levels. When blood sugar levels are persistently high, it can lead to changes in fluid balance within the eyes, causing the lens to swell and affecting the way light is focused. This results in visual disturbances, including blurred vision.

In contrast, other symptoms listed, such as cold and clammy skin, shivering, and rapid weight loss, are typically associated with conditions like hypoglycaemia (low blood sugar) or other ailments. Cold and clammy skin often indicates the body is in distress due to low glucose levels, while shivering can also be a response to low energy states or hypothermia. Rapid weight loss may occur in cases of uncontrolled diabetes, but it is not an immediate or direct symptom of hyperglycaemia. The direct visual effects make blurred vision the most representative symptom in this context.