High Blood Sugar Symptoms You Shouldn't Ignore (And When to See a Doctor)

23 Aug 2025

High Blood Sugar Symptoms You Shouldn't Ignore (And When to See a Doctor) High blood sugar, also known as hyperglycemia, is a condition where there is...

High Blood Sugar Symptoms You Shouldn't Ignore (And When to See a Doctor)

High blood sugar, also known as hyperglycemia, is a condition where there is an excessive amount of glucose circulating in the blood. This can occur for various reasons, most commonly due to diabetes. Understanding the symptoms of high blood sugar is crucial for timely intervention and preventing potentially serious health complications. This article will explore the key symptoms to watch out for and when it's time to seek medical attention.

Understanding Blood Sugar Levels

Before diving into the symptoms, it’s helpful to understand what constitutes a healthy blood sugar level.

  • Normal Blood Sugar (Fasting): Typically between 70-100 mg/dL.
  • Blood Sugar After Meals: Generally, below 140 mg/dL two hours after eating.
  • High Blood Sugar: Readings consistently above 130 mg/dL (fasting) or 180 mg/dL (post-meal) are often indicative of hyperglycemia.

Related reading: Cgm Vs Blood Glucose Meter Choosing The Best Blood Sugar Monitor

Keep in mind these are general guidelines. A healthcare professional can provide personalized targets based on individual health conditions.

Key Symptoms of High Blood Sugar

Here are some of the most common and recognizable symptoms of high blood sugar:

  • Frequent Urination (Polyuria): One of the earliest signs of high blood sugar is the need to urinate more often than usual. This happens because the kidneys are working overtime to filter out excess glucose from the blood.
  • Increased Thirst (Polydipsia): Because of the frequent urination, the body loses fluids, leading to intense thirst. No matter how much you drink, you may still feel dehydrated.
  • Unexplained Weight Loss: When the body can’t use glucose for energy due to a lack of insulin or insulin resistance, it starts breaking down fat and muscle for fuel, leading to unintentional weight loss.
  • Blurry Vision: High blood sugar can affect the lens of the eye, causing temporary blurring of vision.
  • Fatigue: A persistent feeling of tiredness or exhaustion can be a sign that your body isn't efficiently using glucose for energy.
  • Slow-Healing Sores or Cuts: High blood sugar can impair the body's ability to heal wounds.
  • Dry, Itchy Skin: Dehydration and impaired circulation due to high blood sugar can lead to dry and itchy skin.
  • Frequent Infections: High glucose levels can weaken the immune system, making you more susceptible to infections, such as yeast infections or urinary tract infections (UTIs).

Subtle Symptoms Often Overlooked

Sometimes, high blood sugar symptoms can be subtle and easily dismissed. Be mindful of these less obvious indicators:

  • Headaches: Fluctuating blood sugar levels can trigger headaches.
  • Difficulty Concentrating: Brain function can be affected by high blood sugar, leading to trouble focusing.
  • Numbness or Tingling in Hands and Feet (Neuropathy): This symptom often indicates long-term high blood sugar levels causing nerve damage.
  • Erectile Dysfunction: High blood sugar can damage blood vessels and nerves necessary for sexual function in men.

When to See a Doctor

It's crucial to consult a healthcare provider if you experience any of the following:

  • Persistent Symptoms: If you have multiple symptoms of high blood sugar that don't improve over time.
  • Known Risk Factors for Diabetes: If you have a family history of diabetes, are overweight, or have other risk factors.
  • High Blood Sugar Readings: If you regularly monitor your blood sugar (if you have diabetes) and notice consistently high readings that are not responding to your current treatment plan.
  • Symptoms of Diabetic Ketoacidosis (DKA): DKA is a severe complication of high blood sugar characterized by nausea, vomiting, stomach pain, fruity-smelling breath, and rapid breathing. This requires immediate medical attention.
  • Hyperosmolar Hyperglycemic State (HHS): Another serious complication, more common in type 2 diabetes, characterized by extreme thirst, confusion, and drowsiness. This also requires emergency care.

Diagnosing High Blood Sugar

A doctor can diagnose high blood sugar through several tests:

  • Fasting Plasma Glucose (FPG) Test: Measures blood sugar after an overnight fast.
  • A1C Test: Provides an average of blood sugar levels over the past 2-3 months.
  • Oral Glucose Tolerance Test (OGTT): Measures blood sugar levels after drinking a sugary liquid.
  • Random Plasma Glucose (RPG) Test: Measures blood sugar at any time of day, without fasting.
Test Purpose Normal Range High Blood Sugar Indication
Fasting Plasma Glucose (FPG) Measures blood sugar after fasting 70-100 mg/dL >125 mg/dL (on two separate tests)
A1C Test Average blood sugar over 2-3 months Less than 5.7% 6.5% or higher
Oral Glucose Tolerance Test (OGTT) Measures blood sugar after sugary drink Less than 140 mg/dL (2 hours after) >200 mg/dL (2 hours after)
Random Plasma Glucose (RPG) Blood sugar at any time Varies depending on recent meals >200 mg/dL with symptoms

Managing High Blood Sugar

Related reading: Is My Fasting Blood Sugar Level A Cause For Concern

If you are diagnosed with high blood sugar or diabetes, managing your blood sugar is essential to prevent long-term complications. Here are some strategies:

  • Healthy Diet: Focus on a balanced diet rich in fruits, vegetables, whole grains, and lean protein. Limit sugary drinks, processed foods, and saturated fats.
  • Regular Exercise: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Medication: Follow your doctor's recommendations regarding medication, such as insulin or oral diabetes medications.
  • Blood Sugar Monitoring: Regularly check your blood sugar levels as directed by your healthcare provider.
  • Stress Management: Practice stress-reducing techniques, such as yoga, meditation, or deep breathing exercises.
  • Adequate Sleep: Aim for 7-8 hours of quality sleep each night.

Conclusion

Related reading: Decoding Your Test Results Normal Prediabetes Amp Diabetes Ranges

Recognizing the symptoms of high blood sugar and taking prompt action is critical for maintaining good health and preventing serious complications. Don't ignore warning signs like frequent urination, excessive thirst, or unexplained weight loss. If you're concerned about your blood sugar levels, consult your doctor for proper diagnosis and management. Early detection and proactive management can significantly improve your quality of life and reduce the risk of long-term health problems associated with diabetes.