Diabetes Mellitus

High Blood Sugar ยท Hyperglycemia

Symptoms and Complications

People with type 1 diabetes who are not being treated urinate frequently and feel excessively thirsty. They usually feel very tired and experience severe weight loss despite normal or excessive food intake.

The symptoms of type 2 diabetes usually appear more gradually. People with type 2 diabetes who do not have their blood glucose under control often have a persistent, mild thirst. They urinate frequently, and often feel mild fatigue and complain of blurred vision. Many women with the disease have recurring vaginal yeast infections.

Diabetes is a major cause of heart disease, the leading cause of death in the United States. It's also the biggest cause of blindness and kidney failure in adults. Older adults with diabetes are twice as likely to develop high blood pressure as people without diabetes.

People with diabetes are also 25 times more likely to undergo foot and other "lower extremity" amputations due to circulatory problems. Between one-third and one-half of men who have diabetes will experience impotence at some point.

Making the Diagnosis

Diabetes is diagnosed with simple blood tests. Your doctor may diagnose diabetes if the level of glucose in your blood after 8 hours of fasting is 126 mg/dL (7.0 mmol/L) or higher. If your fasting blood glucose is between 100 mg/dL and 125 mg/dL (5.6 mmol/L and 6.9 mmol/L), then you may have a condition known as impaired fasting glucose or prediabetes, which may later develop into diabetes.

Diabetes is also diagnosed if a blood glucose level taken anytime of the day without regard to meals is 200 mg/dL (11.1 mmol/L) or higher, plus you have symptoms characteristic of diabetes (e.g., increased thirst, increased urination, unexplained weight loss). It is important to note that one high blood glucose reading does not mean you have diabetes. In most cases, at least 2 high blood glucose readings are required before your doctor will make a diagnosis, unless type 1 diabetes is suspected or you are very sick. Your doctor may also examine your eyes for signs of damage to the blood vessels of the retina (back of the eye).

Doctors may also diagnose diabetes based on the results of an oral glucose tolerance test (OGTT). With this test, a person fasts and then is given some glucose, after which their blood glucose is tested at various times to determine how quickly the sugar travels out of the bloodstream and into cells. In an OGTT, if the blood glucose level taken 2 hours after 75 g of glucose is given measures 200 mg/dL (11.1 mmol/L) or higher, the doctor may make a diagnosis of diabetes.

Recently, the American Association of Clinical Endocrinologists (AACE) approved the use of hemoglobin A1C (A1C) for the diagnosis of diabetes mellitus. A1C is a blood test that is usually performed every 3 months to monitor the degree of blood glucose control. An A1C value of 6.5% or more is diagnostic of diabetes mellitus.

Treatment and Prevention

Currently, type 1 diabetes is not preventable. However, studies have shown that type 2 diabetes can be prevented by adopting lifestyle changes that include eating a healthy diet and exercising.

In addition, some studies have shown that certain oral antidiabetes medications may play a role in preventing the development of type 2 diabetes for people who are at high risk of developing it. Lifestyle changes and medications may prevent approximately 30% to 60% of type 2 diabetes.

Diabetes is a chronic condition, and it can last an entire life. The goal of treating diabetes is to keep blood glucose levels as close to a normal range as possible. This prevents the symptoms of diabetes and the long-term complications of the condition. If you've been diagnosed with diabetes, your doctor - working with the members of your diabetes care team - will help you find your target blood glucose levels.

More than most conditions, treating diabetes requires a significant amount of real effort on the person's part. Coping with diabetes is a lifelong challenge, so people with diabetes should not be afraid to speak with a doctor or pharmacist if they feel overwhelmed.

Part of a treatment plan for diabetes will involve learning about diabetes, how to manage it, and how to prevent complications. Your doctor, diabetes educator, or other health care professional will help you learn what you need to know so you are able to manage your diabetes as effectively as possible. Keep in mind that learning about diabetes and its treatment will take time. Involving family members or other people who are significant in your life can also help you manage your diabetes.

Although up to 30% of people with diabetes use herbal products to help control blood sugar, there are not enough good quality studies to show that these treatments are safe and effective.

People with type 1 diabetes need insulin* continuously to survive. The only way to cure this disease is to have a pancreas transplant, but the operation is only recommended in a small set of circumstances.

There are three important things a person can do to treat type 2 diabetes:

  • make lifestyle changes
  • use medication
  • monitor blood glucose levels

Like many conditions, treatment of type 2 diabetes begins with lifestyle changes, particularly in regards to diet and exercise. If you have type 2 diabetes, speak to your doctor and diabetes educator about an appropriate diet. You may be referred to a dietitian. It is also a good idea to speak with your doctor before beginning an exercise program to determine what kind and how much exercise is appropriate.

If lifestyle changes don't put blood glucose levels in the target range, medications may be required. Medications for type 2 diabetes include antidiabetes pills, insulin injections, or a combination of both.

Medications are very effective at treating diabetes and reducing the symptoms and long-term effects of the condition. However, hypoglycemia (a blood glucose level that is too low) can occur when taking certain medications for diabetes.

Symptoms of hypoglycemia include:

  • anxiety
  • confusion
  • difficulty concentrating
  • dizziness
  • drowsiness
  • fatigue
  • headache
  • hunger
  • irritability
  • pale skin
  • sweating
  • tremors or shakiness
  • visual changes

If your blood glucose level is extremely low, it is possible to have a seizure or lose consciousness. A health care professional can teach you how to recognize the warning signs of hypoglycemia. People with diabetes should carry candy, sugar, or glucose tablets to treat hypoglycemia.

Hypoglycemia is a side effect of many medications for type 1 and 2 diabetes, but it is never a reason to avoid treatment. The best way to avoid hypoglycemia is to monitor blood glucose.

Frequent measurement of blood glucose levels is the best way to know whether blood glucose levels are in the target range. This is easily done at home with a blood glucose monitor.

It is essential for all people with diabetes to self-monitor blood glucose levels. The number of times you should test your blood glucose will be based on the type of diabetes you have and your diabetes treatment.

It is important to record blood glucose readings taken at different times of the day - after fasting as well as 2 hours after a meal. This allows your doctor to see a snapshot of how your blood glucose levels vary during the day and recommend treatments accordingly. Most blood glucose meters now have "memory" that stores a number of blood glucose tests along with the time and date they were taken. Some even allow for graphs and charts of the results to be created when the monitor is connected to a computer.

A blood test done in the laboratory called the glycosylated hemoglobin test (or A1C test) allows your doctor to see the average of blood glucose values over the last 3 months. This is a good indication of how well your blood glucose has been in control overall and allows your doctor to manage your diabetes more effectively.


*All medications have both common (generic) and brand names. The brand name is what a specific manufacturer calls the product (e.g., Tylenol®). The common name is the medical name for the medication (e.g., acetaminophen). A medication may have many brand names, but only one common name. This article lists medications by their common names. For information on a given medication, check our Drug Information database. For more information on brand names, speak with your doctor or pharmacist.

Ahmad Al-Mubaslat, MD, FACE, Endocrinologist at the Medical Group of Kansas City, MO. Review provided by VeriMed Healthcare Network.

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The contents of this health site are for informational purposes only. Always seek the advice of your physician or other qualified healthcare provider regarding any questions you may have about a medical condition.

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