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Diabetes

Find out about diabetes, including types of diabetes, common symptoms, and possible treatments.

About this information

This NHS content is written for people in England. Services, entitlements and contact routes may differ in other countries.

Diabetes

Types

Diabetes

Symptoms

Diabetes

Causes

Diabetes

Medical treatments

Diabetes

Complications

The main types of diabetes are type 1, type 2 and gestational, which can happen during pregnancy. Only some types come can be prevented.

Symptoms of diabetes include peeing more than usual, feeling very thirsty and very tired, and losing weight without trying.

Type 1 diabetes is usually caused by a problem with your immune system. Other types can be linked to weight, ethnicity, family history and age.

The main treatment for type 1 diabetes is a medicine called insulin. Type 2 treatments can include lifestyle changes and medicines such as insulin.

If your blood glucose is not managed well, diabetes can increase your chance of health problems, like problems with your sight, nerves or kidneys.

Symptoms of diabetes

The most common symptoms of diabetes are:

  • feeling thirsty all the time
  • peeing more than usual
  • feeling very tired
  • losing weight without trying

Ask for an urgent GP appointment or get help from NHS 111 if:

  • you or your child has any symptoms of diabetes

You can call 111 or get help from 111 online . Call 111 if you're asking about a child under 5 years old.

See a GP if you or your child:

  • have a higher risk of developing diabetes

Not everyone with diabetes has symptoms, so it's important to get checked out.

Causes of diabetes

Diabetes is caused by your body not making enough or any of a hormone called insulin, or the insulin not working properly (insulin resistance).

Insulin helps your body use glucose (sugar) for energy. Without it, the level of glucose in your blood becomes too high.

It's not possible to prevent type 1 diabetes because it's usually caused by a problem with your immune system (autoimmune condition).

You may be more likely to get type 2 or gestational diabetes because of your weight, age, ethnicity, or if other people in your family have it.

You can sometimes reduce your risk of getting type 2 and gestational diabetes by making lifestyle changes such as:

  • eating a balanced diet
  • exercising regularly
  • maintaining a healthy weight

Pre-diabetes (non-diabetic hyperglycaemia)

Some people have blood glucose (sugar) levels above the normal range but not high enough to be diagnosed as having diabetes. This is known as pre-diabetes or non-diabetic hyperglycaemia.

People with pre-diabetes are at greater risk of developing type 2 diabetes, but the risk can be reduced through lifestyle changes.

If you have pre-diabetes, you may be eligible for the NHS Diabetes Prevention Programme. This helps people make lifestyle changes and has been shown to help prevent type 2 diabetes.

Treatment for diabetes

The treatment you'll have depends on the type of diabetes you have. You'll be treated by a specialist diabetes team in hospital or at your GP surgery.

Type 1 diabetes treatment includes taking a medicine called insulin for the rest of your life, and regularly checking your blood glucose (sugar) levels.

Type 2 diabetes treatment and gestational diabetes treatment includes lifestyle changes such as eating healthily, exercising and trying to lose weight, and sometimes medicines, such as metformin or insulin.

Long-term complications of diabetes

Having diabetes can increase your chance of getting other health problems, including:

  • heart attack and stroke
  • kidney problems
  • nerve damage and foot problems – diabetes can cause damage to nerves (peripheral neuropathy)
  • sight problems – adults and children aged 12 or over will be
    offered diabetic eye screening every 1 to 2 years
  • gum disease

Complications can develop over time and are linked to high blood glucose (sugar) levels. Managing your blood glucose well and keeping to your agreed target level can lower your chances of getting complications.

Content supplied by the NHS website

Content supplied by the NHS website, refreshed 19 August 2026. View the original NHS article ↗

Licensed under the Open Government Licence v3.0 ↗. MyPHU is independent and is not endorsed by the NHS.