Skip to Content
Home > Wellness > Health Library > Symptoms of Low Blood Sugar
You may have these
symptoms when your blood sugar has dropped below 70
milligrams per deciliter (mg/dL). When you have had
diabetes for many years, you may not always develop symptoms of mild low blood
young children with
diabetes cannot recognize symptoms of low blood sugar.
Others can, but not every time. To be safe, the parents need to do a home blood
sugar test whenever they suspect low blood sugar in a child.
Symptoms may include:
These symptoms may go away shortly after you eat food that
If your blood sugar continues to drop (below 40 mg/dL), your
behavior may change. Symptoms may include:
Symptoms of severe low blood sugar (usually below 20 mg/dL)
If your blood
sugar drops while you are sleeping, your partner or other family members may
notice that you are sweating and behaving differently. Signs of low blood sugar
at night (nocturnal hypoglycemia) include:
You may wake up with a headache in the morning if your
blood sugar was low during the night.
Some people have no symptoms of low blood sugar. The only symptom you may have is confusion. Or you may become unconscious before anyone realizes you have low blood sugar.
You may have hypoglycemic unawareness if you:
If you have hypoglycemic unawareness, test your blood sugar often, especially before activities like driving a car. Keep quick-sugar foods with you. If you take insulin, carry a glucagon emergency kit. You can also give friends and family instructions to treat low blood sugar.
Current as of:
June 4, 2014
E. Gregory Thompson, MD - Internal Medicine & Rhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
How this information was developed to help you make better health decisions.
To learn more, visit Healthwise.org
© 1995-2014 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
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.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.