Having highs (hyperglycaemia) with type 1 diabetes

Hyperglycaemia, or high as it is often called, means a higher than normal level of glucose in the blood. If your blood glucose gets very high, you should always check for ketones in your blood or urine. If tests show ketones in 2 or more tests in a day or if you feel unwell (e.g. if you are vomiting) follow your sick day rules or seek medical advice if you are unsure. Continuing high blood sugar, especially if combined with ketones in the urine, must be taken seriously.

Symptoms of hyperglycaemia

Symptoms of highs are the same as those of untreated diabetes: thirst, frequent urination (peeing) and tiredness. The most common reasons for highs are a mismatch of insulin to the amount of carbohydrate eaten/drunk, but infection or illness can also send blood sugar high, and some people find they can go high when they are stressed, frightened or excited.

Having constantly high blood glucose levels increases the risks of developing complications of diabetes. When there are complications, the parts of the body most likely to be affected are eyes, kidneys, peripheral nerves in the hands, legs and feet, the skin and large blood vessels. The check-ups you are offered at clinic are designed to pick up any signs of these complications as early as possible so any problems can be sorted out quickly.

Maintaining a stable blood glucose level is sometimes very difficult for people on insulin.

Many young people said that they found it easier to recognise hypo symptoms than highs, particularly when their blood glucose is only moderately high. If you do regular blood glucose tests rather than just relying on how you feel, you can keep an eye on exactly how your blood sugar is reacting and keep yourself within safe limits.

Learning to control highs

Some young people indicated that they have had very few highs or hypos since diagnosis and attributed this to checking their blood glucose levels several times during the day particularly around meal times. Those on insulin pump therapy said that they have found it easier to control highs or hypos since they started using one. One young woman said that she could then use her blood glucose result as a guide as to how much carbohydrate she needed to eat at that particular meal. One young man who was diagnosed at the age of 16 initially had a period of high blood glucose levels but he followed the advice from his consultant and eventually his levels became more stable.

She finds it hard to explain how she feels when shes hyperglycaemic.

Age at interview 16

Gender Female

Age at diagnosis 5

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She has had very few highs (or hypos) and uses her blood glucose test result as a guide as to how…

Age at interview 25

Gender Female

Age at diagnosis 24

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He understood that after diagnosis his blood glucose levels would take time to settle and…

Age at interview 24

Gender Male

Age at diagnosis 16

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Sarah feels that she can control her highs much better on insulin pump therapy but warns that it is essential to learn to use it correctly because it only uses short-acting insulin.

Age at interview 36

Gender Female

Age at diagnosis 7

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Young people said that one common reason why they go high sometimes is that they have not injected enough insulin to cover what they have eaten. Some young people said that they might not inject if they are just having a snack or if they wake up late. Missing injections at school could also contribute (see also ‘Insulin: Doing injections everyday’ and ‘Diet and diabetes‘). Some young people experienced their glucose levels going high after drinking sugary drinks, or alcopops.

They talk about those situations in which they might not inject and end up with high blood…

Age at interview 18

Gender Male

Age at diagnosis 9

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The young people we talked to said that, if they have a series of high results, they will try and find the reasons for it. The reasons they found included: eating different foods or more than usual, having sugar without realising it, carbohydrate/insulin ratio being insufficient, working overtime or revising for exams and not doing as much physical activity as usual. In general, a change a routine tended to be the underlying cause of highs.

Describes how he feels when he is high and the possible reasons for it. Says that it is a good…

Age at interview 17

Gender Male

Age at diagnosis 3

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Young people said that running high blood glucose levels could make them feel miserable, angry and depressed. Many talked of feeling lethargic and unable to concentrate during school lessons. Young people suggested that controlling blood glucose levels was the most difficult during the teenage years.

His blood glucose levels used to be very high and this affected his mood. Once he became violent…

Age at interview 16

Gender Male

Age at diagnosis 10

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Says that high blood glucose levels made her feel depressed and that her diabetes doctor has…

Age at interview 22

Gender Female

Age at diagnosis 9

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A number of young people said that they preferred their blood glucose level to be a bit higher rather than lower because they didn’t want to risk having a hypo in front of friends or at school or when they’re alone, particularly if they’ve had experiences of going very low and losing consciousness.

He preferred to have his blood glucose levels a bit high when he was by himself because he was…

Age at interview 19

Gender Male

Age at diagnosis 13

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Checking for ketones

Some young people said that it is a good idea to check for ketones if you have high blood glucose levels. Ketones are an acid that builds up in the blood stream when the body burns its own fat for energy. Leaving it untreated can lead to diabetic ketoacidotic coma. One young woman said she uses Ketostix to check her urine for ketones whenever she thinks she has high blood glucose levels. Another young woman, who has had several episodes of diabetic ketoacidosis (DKA), has been told by her nurse what to do if she finds ketones in her urine.

She has a blood meter that advises her to test her urine for ketones when her blood glucose…

Age at interview 19

Gender Female

Age at diagnosis 3

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If she finds ketones in her urine she drinks plenty of water and has been able to get rid of them…

Age at interview 18

Gender Female

Age at diagnosis 6

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Some young people we talked to used not to inject insulin on a regular basis and ran high blood glucose levels for long periods of time as a result. They found that bringing their blood glucose levels down again can be very difficult both physically and emotionally because when you have been running high for a while, you can still get hypo warning symptoms when your blood sugar levels start to drop, even though the blood test meter says you are not low enough to be ‘officially’ hypo.

When she started injecting insulin regularly again she experienced hypos-type of symptoms even…

Age at interview 20

Gender Female

Age at diagnosis 2

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High blood glucose levels and complications

Several of the young people we talked to have developed diabetes-related complications as a direct result of having high blood glucose levels for years. One young woman developed complications that lead to her been registered blind at the age of 23. Another young woman has developed a skin complication called scleroderma diabeticorum and doctors have also found that the tiny blood vessels in her eyes are leaking.

After years of having high blood glucose levels she developed diabetes-related complications that…

Age at interview 27

Gender Female

Age at diagnosis 7

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Her skin and eyes have been affected by high blood glucose level. Says that these were wake up…

Age at interview 20

Gender Female

Age at diagnosis 3

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One young woman indicated that doctors tend to talk much more about hypos and its complications but feels that highs can also be potentially dangerous and not enough emphasis and advice is given to teenagers on this subject.

Says that there is not enough awareness about the dangers linked to highs; that doctors…

Age at interview 18

Gender Female

Age at diagnosis 10

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Most young people said that it is very important to tell others around you that you have type 1 diabetes. They said that you should always teach your friends about the signs of a hypo and a high and what to do in those situations. (See also ‘Support from parents and families‘ and ‘Friends and relationships‘). They also said that if you are going out, it’s a good idea to wear a diabetes pendant, bracelet or some type of diabetic identity tag so the paramedic will know exactly what to do with you if you end up unconscious.