Learn About Diabetes Self-Assessment Information

Understanding Diabetes: What You Need to Know

Diabetes is a condition where your body has trouble managing blood sugar levels. Blood sugar, also called glucose, comes from the foods you eat. Your pancreas normally makes a hormone called insulin that helps your body use this glucose for energy. When you have diabetes, this process doesn't work the way it should.

There are three main types of diabetes. Type 1 diabetes happens when your pancreas stops making insulin. This type usually starts in childhood or early adulthood, though it can develop at any age. Type 2 diabetes is the most common form, affecting about 90 to 95 percent of people with diabetes. In Type 2, your body either doesn't make enough insulin or can't use it well. The third type is gestational diabetes, which develops during pregnancy. Women who have gestational diabetes have a higher risk of developing Type 2 diabetes later in life.

The numbers around diabetes are significant. According to the Centers for Disease Control and Prevention, more than 37 million Americans have diabetes. About 1 in 5 people with diabetes don't know they have it yet. Each year, roughly 1.5 million Americans are newly diagnosed with diabetes.

Understanding your diabetes type matters because treatment and management differ. Someone with Type 1 needs insulin injections or a pump because their body can't produce it. Type 2 management might involve lifestyle changes, oral medications, or insulin depending on how well blood sugar is controlled. Gestational diabetes typically requires diet changes and blood sugar monitoring during pregnancy.

Practical takeaway: Learning which type of diabetes applies to you or a family member helps you understand what questions to ask your doctor and what management approaches might be discussed.

Common Symptoms and Warning Signs

Recognizing diabetes symptoms matters because early detection can prevent serious complications. However, symptoms vary between types and sometimes appear so gradually that people don't notice them immediately.

Type 1 diabetes symptoms often develop quickly over weeks or even days. Common warning signs include unusual thirst that doesn't go away, frequent urination (especially at night), feeling very tired or fatigued, sudden weight loss without trying, irritability or mood changes, fruity-smelling breath, and blurred vision. In severe cases, Type 1 can cause diabetic ketoacidosis, a dangerous condition where your blood becomes too acidic. This requires emergency medical care and includes symptoms like nausea, vomiting, stomach pain, and difficulty breathing.

Type 2 diabetes develops slowly, and many people have no symptoms at all when first diagnosed. This is why screening becomes important. When symptoms do appear, they may include increased thirst, frequent urination, increased hunger (especially after eating), fatigue or tiredness, blurred vision, numbness or tingling in hands or feet, and slow-healing cuts or bruises. Some people notice dark patches of skin, usually in skin folds like the neck or armpits—a condition called acanthosis nigricans that sometimes appears with Type 2 diabetes.

Gestational diabetes usually has no symptoms. It's typically discovered during routine screening between 24 and 28 weeks of pregnancy. That's why prenatal care and testing are important for pregnant women.

It's important to understand that having symptoms doesn't guarantee diabetes, and not having symptoms doesn't mean you don't have it. Many other conditions share similar symptoms with diabetes.

Practical takeaway: If you notice any of these symptoms lasting more than a few weeks, discussing them with your doctor helps determine whether testing or further evaluation is needed.

Risk Factors and Who Should Consider Screening

Certain factors increase the likelihood of developing diabetes. Understanding your risk level helps you decide whether discussing screening with your doctor makes sense.

For Type 1 diabetes, risk factors include family history—having a parent or sibling with Type 1 increases your risk—and certain genetic markers. People of certain ethnic backgrounds, including those of European descent, have higher rates. Environmental factors like viral infections may also play a role, though researchers are still studying exactly how.

Type 2 diabetes risk factors are more numerous and often overlapping. Age matters; risk increases significantly after age 45, though Type 2 is increasingly diagnosed in younger adults and children. Family history is significant—having a parent or sibling with Type 2 diabetes raises your risk. Weight is a major factor. Being overweight or having obesity, particularly weight concentrated around the abdomen, increases risk. Physical inactivity contributes to risk. People who don't exercise regularly or have sedentary jobs face higher risk. Race and ethnicity also matter; Type 2 is more common in African American, Hispanic/Latino, American Indian, Native Alaskan, Asian American, and Pacific Islander populations.

Other Type 2 risk factors include having prediabetes (blood sugar levels higher than normal but not yet in the diabetes range), gestational diabetes history, polycystic ovary syndrome (PCOS) in women, and sleep problems like sleep apnea. High blood pressure and abnormal cholesterol levels also increase Type 2 risk.

Health organizations recommend screening starting at age 45 for all adults, and earlier for those with risk factors. The American Diabetes Association suggests screening at any age if you're overweight and have one or more risk factors.

Practical takeaway: Reviewing these risk factors and discussing your personal risk profile with your doctor helps determine whether screening tests would be valuable for you.

Self-Monitoring and Tracking Your Health

For people with diabetes, regular self-monitoring provides critical information about how well blood sugar is controlled and how your body responds to food, activity, stress, and medications.

Blood sugar monitoring involves checking glucose levels using a small device called a glucose meter. A tiny drop of blood from a finger prick goes on a test strip, and the meter displays your blood sugar level within seconds. Readings help show patterns—whether levels are well-controlled, trending high or low, and how specific foods or activities affect you. Most people with Type 1 diabetes check blood sugar multiple times daily. Type 2 monitoring frequency varies based on treatment; those taking insulin check more often than those managing with diet alone.

Continuous glucose monitors (CGMs) are newer technology that measure glucose levels every few minutes throughout the day and night using a small sensor worn on your skin. Many CGMs send readings to your phone. This technology helps identify patterns you might miss with occasional finger-stick checks and alerts you to dangerously high or low readings.

Beyond blood sugar checks, tracking other information helps you and your doctor understand your overall health. Keeping a log of what you eat and how much you exercise provides data on how these factors affect your blood sugar. Recording how you're feeling—energy levels, mood, sleep quality—shows how diabetes affects daily life. Noting medications and their timing helps ensure consistent use. Some people track stress levels, since stress hormones can raise blood sugar.

Blood pressure and weight monitoring matter because high blood pressure and excess weight increase diabetes complications risk. Annual tests measure hemoglobin A1C, which reflects your average blood sugar over about three months. This test shows whether your overall blood sugar control is improving or needs adjustment.

Practical takeaway: Starting simple—checking blood sugar at specific times and noting what you ate and how you felt—creates a picture of what affects your individual body, which you can discuss with your healthcare team.

Understanding Test Results and What Numbers Mean

Diabetes-related blood tests measure different things and give different information. Understanding what these numbers mean helps you grasp where your blood sugar stands and what changes might help.

Fasting blood glucose measures your blood sugar after 8 to 10 hours without food. A normal fasting level is below 100 mg/dL. Levels between 100 and 125 mg/dL indicate prediabetes. A fasting level of 126 mg/dL or higher suggests diabetes. This test is simple, quick, and inexpensive, making it common for initial screening.

The A1C test (also called hemoglobin A1C or glycated hemoglobin) measures your average blood sugar over roughly three months. The test works because glucose sticks to red blood cells, and the older the cell, the more glucose it has picked up. Normal A1C is below 5.7 percent. Prediabetes range is 5.7 to 6.4 percent. A1C