Diabetes is a disease characterised by high blood glucose (hyperglycaemia). This is due to a problem with insulin production or action and if left untreated, can result in persistent uncontrolled high blood glucose (hyperglycaemia).

Over a period of hours to days, uncontrolled hyperglycaemia can result in an increased osmotic diuresis.

Symptoms of hyperglycaemia can include:

• Thirst
• Increased urination
• Blurred vision
• Nausea
• Fatigue
• Headache
• Drowsiness