When your blood glucose levels are too high, it can cause hyperglycaemia (a hyper).

This can happen if you're:

Speak to your care team if your blood glucose levels are high and you:

Very high blood sugar levels can lead to a serious problem called diabetic ketoacidosis (DKA).

Your body starts to break down fat for energy when there's not enough insulin, which leads to a build-up of acid (ketones) in your blood.

It can be life threatening and should be treated in hospital.

Check for ketones if your blood glucose level is higher than 11mmol.

Some meters check for ketones, or you can get strips from your care team to check ketones in your pee.

DKA can develop quickly over a few hours. Infections and drinking too much alcohol are common triggers for DKA.

Speak to your care team immediately if your glucose level is high and you:

You might need treatment in hospital.

Read more about hyperglycaemia on Diabetes UK

Page last reviewed: 7 July 2021
Next review due: 7 July 2024