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Hyperglycaemia – high blood glucose

When your blood glucose levels are high, this is called hyperglycaemia (hyper).

This can happen if you're:

  • stressed
  • unwell
  • less active than usual
  • sick
  • not having enough food insulin for the amount of carbohydrate you've eaten
  • not having enough background insulin

Your diabetes team will agree your personal blood glucose targets with you.

Types of insulin

Non-urgent advice: Speak to your care team if your blood glucose levels are high and you:

  • feel very thirsty
  • pee more than normal
  • feel tired all the time
  • lose weight without trying
  • have blurred vision
  • have fruity-smelling breath

Urgent advice: Contact your diabetes team or go to the emergency department immediately if your glucose level is high and you:

You probably need treatment in hospital. Do not delay seeking medical attention.

Page last reviewed: 17 October 2023
Next review due: 17 October 2026

This project has received funding from the Government of Ireland’s Sláintecare Integration Fund 2019 under Grant Agreement Number 9.