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The most common symptoms associated with diabetes include:
- Feeling thirsty all the time
- Losing weight (without meaning to)
- Feeling tired
- Blurred vision
- Cuts/ wounds taking longer to heal
- Peeing more than usual
- Repeatedly getting thrush

Having fruity-smelling breath is also a symptom of type 1 diabetes. The symptoms for type 1 diabetes appear rapidly, which can lead a diabetic to be very sick by the time they are diagnosed.

In type 2 diabetes, the symptoms progress slowly which means sometimes a diabetic person doesn't realise they are experiencing the symptoms

https://www.nhs.uk/conditions/type-1-diabetes/symptoms-and-getting-diagnosed/

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There are 2 main types of diabetes.

Type 1 diabetes occurs when the body stops producing insulin, a hormone which breaks down glucose in the body, so blood sugar levels increase.

Type 2 diabetes occurs when cells in the body stops reacting to the hormone insulin as effectively as they should or there is too much glucose in the body for the insulin to break down.

https://medlineplus.gov/ency/article/001214.htm

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Insulin is a hormone produced by the pancreas to control blood sugar. Diabetes can be caused by too little insulin, resistance to insulin, or both.

To understand diabetes, it is important to first understand the normal process by which food is broken down and used by the body for energy. Several things happen when food is digested and absorbed:

A sugar called glucose enters the bloodstream. Glucose is a source of fuel for the body.

An organ called the pancreas makes insulin. The role of insulin is to move glucose from the bloodstream into muscle, fat, and other cells, where it can be stored or used as fuel.

People with diabetes have high blood sugar because their body cannot move sugar from the blood into muscle and fat cells to be burned or stored for energy, and/or because their liver makes too much glucose and releases it into the blood. This is because either:

Their pancreas does not make enough insulin

Their cells do not respond to insulin normally

Both of the above

There are two major types of diabetes. The causes and risk factors are different for each type:

Type 1 diabetes is less common. It can occur at any age, but it is most often diagnosed in children, teens, or young adults. In this disease, the body makes little or no insulin. This is because the pancreas cells that make insulin stop working. Daily injections of insulin are needed. The exact cause of the failure to make enough insulin is unknown.

Type 2 diabetes is more common. It most often occurs in adulthood, but because of high obesity rates, children and teens are now being diagnosed with this disease. Some people with type 2 diabetes do not know they have it. With type 2 diabetes, the body is resistant to insulin and doesn't use insulin as well as it should. Not all people with type 2 diabetes are overweight or obese.

There are other causes of diabetes, and some people cannot be classified as type 1 or type 2.

Gestational diabetes is high blood sugar that develops at any time during pregnancy in a woman who does not already have diabetes.

If your parent, brother, or sister has diabetes, you may be more likely to develop the disease.

A high blood sugar level can cause several symptoms, including:

Blurry vision

Excess thirst

Fatigue

Frequent urination

Hunger

Weight loss

Because type 2 diabetes develops slowly, some people with high blood sugar have no symptoms.

Symptoms of type 1 diabetes develop over a short period. People may be very sick by the time they are diagnosed.

After many years, diabetes can lead to other serious problems. These problems are known as diabetes complications, and include:

Eye problems, including trouble seeing (especially at night), light sensitivity, and blindness

Sores and infections of the leg or foot, which if untreated, can lead to amputation of the leg or foot

Damage to nerves in the body, causing pain, tingling, a loss of feeling, problems digesting food, and erectile dysfunction

Kidney problems, which can lead to kidney failure

Weakened immune system, which can lead to more frequent infections

Increased chance of having a heart attack or stroke

A urine analysis may show high blood sugar. But a urine test alone does not diagnose diabetes.

Your health care provider may suspect that you have diabetes if your blood sugar level is higher than 200 mg/dL (11.1 mmol/L). To confirm the diagnosis, one or more of the following tests must be done.

Blood tests:

Fasting blood glucose level. Diabetes is diagnosed if the fasting glucose level is 126 mg/dL (7.0 mmol/L) or higher on two different tests. Levels between 100 and 125 mg/dL (5.5 and 7.0 mmol/L) are called impaired fasting glucose or prediabetes. These levels are risk factors for type 2 diabetes.

Hemoglobin A1C (A1C) test. Normal is less than 5.7%; prediabetes is 5.7% to 6.4%; and diabetes is 6.5% or higher.

Oral glucose tolerance test. Diabetes is diagnosed if the glucose level is 200 mg/dL (11.1 mmol/L) or higher 2 hours after drinking a special 75 gram sugar drink (this test is used more often for type 2 diabetes).

Screening for type 2 diabetes in people who have no symptoms is recommended for:

Overweight children who have other risk factors for diabetes, starting at age 10 and repeated every 3 years.

Overweight adults (BMI of 25 or higher) who have other risk factors such as having high blood pressure, or having a mother, father, sister or brother with diabetes.

Overweight women who have other risk factors such as high blood pressure who are planning to become pregnant.

Adults over age 45, repeated every 3 years or at a younger age if the person has risk factors.

Type 2 diabetes can sometimes be reversed with lifestyle changes, especially losing weight with exercise and by eating healthier foods. Some cases of type 2 diabetes can also be improved with weight loss surgery.

There is no cure for type 1 diabetes (except for a pancreas or islet cell transplant).

Treating either type 1 diabetes or type 2 diabetes involves nutrition, activity and medicines to control blood sugar level.

Everyone with diabetes should receive proper education and support about the best ways to manage their diabetes. Ask your provider about seeing a certified diabetes educator (CDE).

Getting better control over your blood sugar, cholesterol, and blood pressure levels helps reduce the risk for kidney disease, eye disease, nervous system disease, heart attack, and stroke.

To prevent diabetes complications, visit your provider at least 2 to 4 times a year. Talk about any problems you are having. Follow your provider's instructions on managing your diabetes.

Many resources can help you understand more about diabetes. If you have diabetes, you can also learn ways to manage your condition and prevent diabetes complications.

Diabetes is a lifelong disease for most people who have it.

Tight control of blood glucose can prevent or delay diabetes complications. But these problems can occur, even in people with good diabetes control.

After many years, diabetes can lead to serious health problems:

You could have eye problems, including trouble seeing (especially at night), and light sensitivity. You could become blind.

Your feet and skin can develop sores and infections. After a long time, your foot or leg may need to be amputated. Infection can also cause pain and itching in other parts of the body.

Diabetes may make it harder to control your blood pressure and cholesterol. This can lead to a heart attack, stroke, and other problems. It can become harder for blood to flow to your legs and feet.

Nerves in your body can get damaged, causing pain, tingling, and numbness.

Because of nerve damage, you could have problems digesting the food you eat. You could feel weakness or have trouble going to the bathroom. Nerve damage can make it harder for men to have an erection.

High blood sugar and other problems can lead to kidney damage. Your kidneys may not work as well as they used to. They may even stop working so that you need dialysis or a kidney transplant.

Your immune system can weaken, which can lead to frequent infections.

Keeping an ideal body weight and an active lifestyle may prevent or delay the start of type 2 diabetes. If you're overweight, losing just 5% of your body weight can reduce your risk. Some medicines can also be used to delay or prevent the start of type 2 diabetes.

At this time, type 1 diabetes cannot be prevented. But there is promising research that shows type 1 diabetes may be delayed in some high risk people.

Diabetes - type 1; Diabetes - type 2; Diabetes - gestational; Type 1 diabetes; Type 2 diabetes; Gestational diabetes; Diabetes mellitus

American Diabetes Association. 2. Classification and Diagnosis of Diabetes: Standards of Medical Care in Diabetes-2021. Diabetes Care. 2021 Jan;44(Suppl 1):S15-S33. PMID: 33298413 pubmed.ncbi.nlm.nih.gov/33298413/.

Atkinson MA, Mcgill DE, Dassau E, Laffel L. Type 1 diabetes mellitus. In: Melmed S, Auchus, RJ, Goldfine AB, Koenig RJ, Rosen CJ , eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 36.

Riddle MC, Ahmann AJ. Therapeutics of type 2 diabetes mellitus. In: Melmed S, Auchus, RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 35.

Updated by: Brent Wisse, MD, board certified in Metabolism/Endocrinology, Seattle, WA. Internal review and update on 06/03/2021 by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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Insulin is a hormone produced by the pancreas to control blood sugar. Diabetes can be caused by too little insulin, resistance to insulin, or both. To understand diabetes, it is important to first understand the normal process by which food is broken down and used by the body for energy.