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Man testing his blood glucose level with a glucometer.

Man testing his blood glucose level with a glucometer.
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Type 1 diabetes

5-minute read

What is type 1 diabetes?

Diabetes is a condition that occurs when the body cannot maintain healthy levels of sugar (glucose) in the blood. Type 1 diabetes is diabetes caused by the immune system attacking and destroying the cells in the pancreas that produce insulin.

The pancreas is an organ below and behind the stomach that produces the hormone insulin. Insulin moves glucose into the cells to be stored and used for energy.

In type 1 diabetes, the pancreas is unable to produce insulin. Without insulin, glucose stays in the blood, causing the blood glucose level to be higher than normal. This then causes the problems associated with diabetes.

Type 2 diabetes develops when the body does not make enough insulin or does not use it well.

What are the symptoms of type 1 diabetes?

If you have high blood glucose, you may experience the following symptoms of type 1 diabetes, which you can remember with the four 'Ts':

  • thirst — being very thirsty (and possibly hungry)
  • toilet — urinating more often
  • thinner — experiencing unexplained weight loss
  • tired — feeling unusually tired

CHECK YOUR SYMPTOMS — Use the diabetes Symptom Checker and find out if you need to seek medical help.

Diabetic ketoacidosis symptoms

If your blood glucose is very high, you may experience a serious emergency condition called diabetic ketoacidosis (DKA). In diabetic ketoacidosis, your body burns fat instead of glucose for energy, producing by-products called ketones.

Symptoms include:

  • fast breathing
  • breath that smells like nail polish remover
  • stomach pain
  • flushed cheeks
  • vomiting
  • dehydration

DKA is a serious condition that requires immediate assessment. If someone, who you know has diabetes, becomes confused or unconscious, call triple zero (000) for an ambulance.

What causes type 1 diabetes?

The exact cause of type 1 diabetes is not known. Type 1 diabetes is an autoimmune condition where the body’s immune system attacks the pancreas cells. It cannot be prevented, even by adopting a healthy lifestyle.

The risk of type 1 diabetes can be passed down through families. If you have a parent, brother or sister with type 1 diabetes, you have a higher chance of developing type 1 than someone who is not related to a person who has the condition.

Type 1 diabetes can happen at any age but is more common in young people — more than 60% of people diagnosed with type 1 diabetes in Australia are aged under 25.

How is type 1 diabetes diagnosed?

If your doctor thinks you may have diabetes, you will probably need to have a blood test.

You may be asked to take a fasting blood glucose test, where you don’t eat for 8 hours before the test, or a random blood glucose test, where you don’t need to fast.

You may also need to have an oral glucose tolerance test where you have blood glucose tests after you drink a sugary drink.

You may also be asked to have your urine tested for ketones.

FIND A HEALTH SERVICE — The Service Finder can help you find doctors, pharmacies, hospitals and other health services.

ASK YOUR DOCTOR — Preparing for an appointment? Use the Question Builder for general tips on what to ask your GP or specialist.

How is type 1 diabetes managed?

Although there is currently no cure, type 1 diabetes can be managed with insulin and by having a healthy lifestyle.

If you have type 1 diabetes, you will need insulin replacement, through injections or an insulin pump, to control your blood glucose levels.

Having a healthy diet and being physically active can also help control your blood glucose levels and improve your health.

Living with type 1 diabetes

Being diagnosed with type 1 diabetes can be overwhelming. However, besides using insulin treatment, you can successfully manage diabetes by:

What are the complications of type 1 diabetes?

Treating type 1 diabetes is important to prevent long-term complications, such as:

Resources and support

You can join the National Diabetes Services Scheme (NDSS) for free to access a range of resources, support services and subsidised diabetes products.

Visit Diabetes Australia for information and resources.

Learn more here about the development and quality assurance of healthdirect content.

Last reviewed: July 2020

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