Prediabetes is a common health condition in which blood sugar levels are higher than normal but not yet high enough to meet the criteria for type 2 diabetes. It can develop gradually, and many people have no obvious symptoms at all. That is why regular blood-sugar testing is especially important for people with risk factors.The good news is that prediabetes can often be improved—and in many cases reversed—through healthy lifestyle changes and, when appropriate, medication recommended by a healthcare professional.
What Is Prediabetes?
Prediabetes means your blood glucose is above the healthy range. It is an important warning sign because it increases the risk of developing type 2 diabetes, heart disease, and other metabolic problems.
Prediabetes is usually identified through a blood test rather than symptoms alone. Common diagnostic tests include fasting blood glucose, an A1C test, and sometimes an oral glucose tolerance test.
Because symptoms can be subtle or completely absent, you should not rely on how you feel to determine whether you have prediabetes.
12 Possible Symptoms and Warning Signs of Prediabetes
Prediabetes itself frequently causes no noticeable symptoms, but some people may experience symptoms associated with rising blood sugar or insulin resistance.
1. Increased Thirst
Feeling unusually thirsty or needing to drink more water than usual can occur when blood glucose becomes elevated. However, thirst has many other possible causes, including heat, exercise, dehydration, and certain medications.
2. Frequent Urination
Higher-than-normal blood sugar can cause the kidneys to work harder to remove excess glucose. This may contribute to urinating more often, particularly if blood glucose becomes significantly elevated.
3. Increased Hunger
Some people with insulin resistance may feel hungry soon after eating. When insulin does not work efficiently, the body may have difficulty using glucose effectively for energy.
4. Unexplained Fatigue
Persistent tiredness can have many causes, but changes in glucose metabolism may contribute to feeling unusually low on energy.
5. Difficulty Losing Weight
Insulin resistance can make weight management more challenging for some people. However, difficulty losing weight is not proof of prediabetes and can be influenced by diet, activity, sleep, hormones, medications, and many other factors.
6. Blurred Vision
Changes in blood glucose can temporarily affect the fluid balance in the eye and cause blurred vision. Persistent or sudden vision changes should be evaluated by a healthcare professional.
7. Slow-Healing Cuts or Sores
High blood sugar can interfere with normal healing and immune function. A wound that repeatedly heals slowly deserves medical attention.
8. Darkened Skin Around the Neck
A dark, thicker, velvety area of skin—particularly around the neck, armpits, or groin—can be a sign of acanthosis nigricans, which is commonly associated with insulin resistance.
It does not, however, confirm that someone has prediabetes.
9. Tingling or Numbness
Tingling, burning, or numbness in the hands or feet can occur with prolonged high blood sugar. These symptoms are more commonly associated with diabetes than early prediabetes and should be assessed by a doctor.
10. Recurrent Infections
Frequent infections, particularly certain skin or genital infections, can occur when blood glucose is persistently elevated. Other medical conditions can cause recurrent infections as well.
11. Unexplained Changes in Weight
Unexpected weight changes can have numerous causes. Significant unexplained weight loss, especially when accompanied by thirst or frequent urination, should be evaluated promptly.
12. Feeling Generally Unwell
Some people report feeling tired, sluggish, or generally unwell when their blood sugar regulation is impaired. Because these symptoms are nonspecific, blood testing is much more reliable than symptoms alone.
Important: Prediabetes May Have No Symptoms
This is one of the most important things to understand.
A person can have prediabetes and feel completely normal.
If you have risk factors such as excess weight, a family history of type 2 diabetes, high blood pressure, physical inactivity, a history of gestational diabetes, or certain metabolic conditions, ask a healthcare professional whether blood-glucose screening is appropriate.
How Is Prediabetes Diagnosed?
Prediabetes is diagnosed using blood tests rather than symptoms.
Common tests include:
- A1C: Measures average blood glucose over approximately the previous 2–3 months.
- Fasting plasma glucose: Measures blood glucose after fasting.
- Oral glucose tolerance test: Measures how the body handles glucose after drinking a glucose-containing solution.
Your healthcare professional can determine which test is most appropriate and interpret the results in context.
How Is Prediabetes Treated?
The main goal of treatment is to prevent or delay progression to type 2 diabetes.
1. Improve Your Diet
Focus on nutrient-dense foods such as:
- Non-starchy vegetables
- Beans and lentils
- Whole grains
- Nuts and seeds
- Eggs, fish, poultry, and other protein sources
- Plain yogurt and other minimally processed foods
- Whole fruits in appropriate portions
Limit foods and drinks that contain large amounts of added sugar, such as sugary beverages, sweets, and highly processed snacks.
You do not necessarily need to eliminate carbohydrates. Choosing higher-fiber carbohydrate sources and controlling portions can be a more sustainable approach.
2. Increase Physical Activity
Regular physical activity helps the body use insulin more effectively.
A practical goal for many adults is to work toward at least 150 minutes of moderate-intensity physical activity per week, such as brisk walking, while also incorporating muscle-strengthening activities when appropriate.
If you have been inactive, start gradually and choose activities that are safe for your fitness level.
3. Work Toward a Healthy Weight
For people who have overweight or obesity, even a modest amount of weight loss can improve blood-sugar control and reduce the risk of progressing to type 2 diabetes.
Rather than following extreme diets, focus on sustainable changes that you can maintain over time.
4. Get Enough Sleep
Poor or insufficient sleep can affect appetite, metabolism, and insulin sensitivity. Establishing a consistent sleep schedule and addressing persistent sleep problems may support overall metabolic health.
5. Stop Smoking
Smoking is associated with an increased risk of type 2 diabetes and cardiovascular disease. If you smoke, quitting is one of the most valuable steps you can take for your overall health.
6. Take Medication Only When Recommended
Lifestyle changes are the foundation of prediabetes management. In certain high-risk individuals, a healthcare professional may consider medication such as metformin.
Medication is not appropriate for everyone with prediabetes, so it should be discussed with a qualified healthcare professional rather than started independently.
Can Prediabetes Be Reversed?
Prediabetes does not always progress to diabetes.
For many people, improving diet, increasing physical activity, managing weight, and addressing other risk factors can significantly improve blood glucose levels.
However, “reversal” does not mean the risk disappears forever. Continuing healthy habits and having appropriate follow-up testing are important.
When Should You Get Tested?
Consider speaking with a healthcare professional about screening if you have risk factors for prediabetes or diabetes, especially if you have a family history of type 2 diabetes, excess weight, high blood pressure, physical inactivity, or a history of gestational diabetes.
If you develop symptoms such as excessive thirst, frequent urination, unexplained weight loss, severe weakness, vomiting, confusion, or significant changes in vision, seek medical evaluation rather than trying to treat the problem at home.
The Bottom Line
Prediabetes is often a silent warning sign, which means you may have it without experiencing the 12 symptoms described above. Blood testing is the most reliable way to find out whether your blood glucose is in the prediabetes range.
The most effective approach is usually a combination of healthier eating, regular physical activity, sustainable weight management, adequate sleep, and appropriate medical follow-up. For people at particularly high risk, a healthcare professional may also recommend medication.
Recognizing risk factors early and taking action can make a meaningful difference in reducing the likelihood of developing type 2 diabetes.