What Is High Blood Sugar?
High blood sugar, known medically as hyperglycemia, occurs when there is too much glucose circulating in your bloodstream. Glucose is your body's main source of energy, derived from the food you eat. The hormone insulin helps move glucose from your blood into
your cells for energy. When your body doesn't produce enough insulin or can't use it effectively, glucose builds up in the blood. This can happen temporarily due to factors like stress, illness, or certain medications, even in people without diabetes. However, chronically high levels are a hallmark of diabetes and require medical management.
Common Warning Signs to Watch For
The body has several ways of signalling that blood sugar might be too high. These symptoms often develop gradually. Early or mild signs can include increased thirst, frequent urination, fatigue, and headaches. As your kidneys work overtime to filter excess sugar from the blood, they pull more fluids from your tissues, leading to dehydration and a constant need to drink water and visit the bathroom. If levels remain elevated, you might experience blurred vision, unexplained weight loss, or slow-healing cuts and sores. Some people also report nerve pain, tingling in the hands and feet, or frequent skin infections.
Why Symptoms Alone Are Not a Diagnosis
Relying solely on symptoms to diagnose high blood sugar is a dangerous shortcut. Many of these signs are non-specific and can be attributed to a wide range of other conditions. Fatigue could be from poor sleep or stress. Increased urination might be related to a urinary tract infection. Furthermore, some people with high blood sugar, especially in the early stages, may not notice any symptoms at all. Other factors can mimic hyperglycemia symptoms, including stress, infections, certain medications like steroids, and even changes in your daily routine. Mistaking these for a definitive sign of a blood sugar issue can lead to unnecessary anxiety or, worse, ignoring another underlying medical problem. Only proper testing can provide a clear and accurate picture.
The Gold Standard: Clinical Testing
If you are concerned about high blood sugar, a healthcare provider is your best resource. They can order simple but powerful blood tests to get a definitive answer. The most common tests include the Fasting Plasma Glucose (FPG) test, which measures your blood sugar after an overnight fast, and the A1C test, which provides an average of your blood sugar levels over the past two to three months. Another option is the Oral Glucose Tolerance Test (OGTT), where your blood sugar is tested before and after you consume a sugary drink. These tests are the established medical standards for diagnosing prediabetes and diabetes, offering the accuracy that a symptom checklist can never provide.
Risks of Untreated High Blood Sugar
Ignoring persistently high blood sugar has serious consequences. Over time, elevated glucose can damage blood vessels throughout the body. This can lead to severe longterm complications, including heart disease, stroke, kidney disease (nephropathy), and nerve damage (neuropathy), especially in the hands and feet. It can also harm the tiny blood vessels in your eyes, potentially causing vision loss and blindness (retinopathy). In acute, severe cases, particularly in people with undiagnosed Type 1 diabetes, it can lead to a lifethreatening condition called diabetic ketoacidosis (DKA), which requires emergency medical attention.
