Skip to Content
Home > Patients & Visitors > Health Library > Symptoms of High Blood Sugar
High blood sugar (hyperglycemia) is most often seen in people who have diabetes that isn't well controlled. The symptoms of high blood sugar can be mild, moderate, or severe.
If your blood sugar levels are
consistently higher than your target range (usually 200 milligrams per deciliter (mg/dL) to 350 mg/dL in adults and 200 mg/dL to 240 mg/dL in children), you may have
mild symptoms of high blood sugar. You may urinate more than usual if you are
drinking plenty of liquids. Some people who have
diabetes may not notice any symptoms when their blood
sugar level is in this range. The main symptoms of high blood sugar are:
Young children are unable to
recognize symptoms of high blood sugar. Parents need to do a home blood sugar
test on their child whenever they suspect high blood sugar.
don't drink enough liquids to replace the fluids lost from high blood sugar
levels, you can become dehydrated. Young children can become
dehydrated very quickly. Symptoms of dehydration
If your blood
sugar levels are consistently high (usually above 350 mg/dL in adults and above 240 mg/dL in children), you may have
moderate to severe symptoms of high blood sugar. These symptoms include:
If your body produces little or no insulin (people with
type 1 diabetes and some people with
type 2 diabetes), you also may have:
If your blood sugar levels continue to rise, you may become
confused and lethargic. You also may become unconscious if your blood sugar
levels are very high.
Health Tools help you make wise health decisions or take action to improve your health.
ByHealthwise StaffPrimary Medical ReviewerE. Gregory Thompson, MD - Internal MedicineSpecialist Medical ReviewerRhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
Current as ofMay 23, 2016
Current as of:
May 23, 2016
E. Gregory Thompson, MD - Internal Medicine & Rhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Send Us Your Feedback
North Kansas City Hospital