Introduction

Low blood sugar, also called hypoglycemia, occurs when the sugar (glucose) level in the blood drops below what the body needs to function normally.

Key points

• Not all oral medicines for diabetes cause low blood sugar. Usually, these medicines cause blood sugar to drop low enough to cause only mild symptoms, such as sweating, shakiness, and hunger. If your child eats something that contains sugar, his or her blood sugar level will rise. But if your child doesn't eat something that contains sugar, his or her blood sugar may continue to drop to a very low level. Symptoms of severe hypoglycemia can include disorientation, confusion, combativeness, and loss of consciousness.
• Taking too many doses of oral medicine for diabetes in one day, not eating enough food, or doing strenuous exercise can cause your child's blood sugar level to drop below the safe range. If your child's blood sugar drops very low, he or she could go into a coma and possibly die.
• To prevent serious problems from low blood sugar:
  • Test your child's blood sugar often. Or have your child test his or her own blood sugar.
  • Be alert to the early signs of low blood sugar, such as sweating, shakiness, hunger, blurred vision, and dizziness.
  • Keep some hard candy, raisins, or other sugar foods with your child at all times. Have your child eat some at the first sign of low blood sugar.
  • Teach your child's caregivers, teachers, and coaches what to do if your child has low blood sugar.

 What is low blood sugar?
 Why is low blood sugar a problem?
 How do you deal with low blood sugar?
 Where to go from here

More information about children with diabetes can be found in these topics:

• Type 1 Diabetes: Children Living With the Disease
• Type 2 Diabetes in Children

Return to topic:

What is low blood sugar?

Low blood sugar (hypoglycemia) means that the level of sugar, or glucose, in your child's blood has dropped below what his or her body needs to function normally. When your child's blood sugar level drops below 70 milligrams per deciliter (mg/dL), he or she most likely will have symptoms, such as feeling tired, weak, or shaky. A very low blood sugar level (below 20 mg/dL) can develop quickly and is an emergency requiring immediate care.

The sulfonylureas—such as glipizide (Glucotrol), glimepiride (Amaryl), and glyburide (DiaBeta)—and insulin injections can cause low blood sugar levels. Low levels from sulfonylurea medicines usually cause only symptoms of mild low blood sugar, unless a child also takes insulin.

Sometimes people with diabetes develop low blood sugar levels during the night. This is not likely to happen unless your child takes insulin injections. If it does happen, your child may wake up in a cold sweat and feel weak. But your child may sleep through it because his or her body uses stored sugar to raise the blood sugar back to a safe level. If this happens, your child most likely will wake up in the morning with a headache and possibly high blood sugar.

What causes low blood sugar?

Low blood sugar levels can occur if your child:

• Takes too many doses of a sulfonylurea in one day or takes doses too close together.
• Continues to take the full dose of sulfonylurea but does not eat his or her usual amount of food.
• Exercises strenuously without eating enough.

Your child may have symptoms of low blood sugar if his or her blood sugar drops to a level lower than usual. For example, if your child's level has been in the 300s for a week and it drops suddenly to 100, he or she may have symptoms of low blood sugar. After your child has had diabetes for many years, he or she may not have symptoms of hypoglycemia until the blood sugar level is very low. This is called hypoglycemia unawareness.

Very low blood sugar levels usually do not occur in children who take oral medicines other than sulfonylureas. These medicines include metformin (Glucophage), acarbose (Precose), rosiglitazone (Avandia), pioglitazone (Actos). Very low blood sugar more commonly occurs in children who take insulin injections.

Test Your Knowledge

1. Low blood sugar means that the level of sugar in the blood has dropped below what the body needs to function normally (usually below 70 mg/dL).
1. True
   

   The answer is correct

   Low blood sugar means that the level of sugar in the blood has dropped below what the body needs to function normally, usually below 70 mg/dL. When your child's blood sugar level drops below 70 mg/dL, he or she most likely will have symptoms, such as feeling tired, weak, or shaky.

   
2. False
   

   The answer is incorrect

   Low blood sugar does mean that the level of sugar in the blood has dropped below what the body needs to function normally, usually below 70 mg/dL. When your child's blood sugar level drops below 70 mg/dL, he or she most likely will have symptoms, such as feeling tired, weak, or shaky.

   
2. A very low blood sugar level (below 20 mg/dL) is an emergency and requires immediate care.
1. True
   

   The answer is correct

   A very low blood sugar level (below 20 mg/dL) is an emergency, and your child will need care immediately. If your child does not receive immediate care, a very low blood sugar level can lead to coma and death.

   
2. False
   

   The answer is incorrect

   A very low blood sugar level (below 20 mg/dL) is an emergency, and your child will need care immediately. If your child does not receive immediate care, a very low blood sugar level can lead to coma and death.

   

Continue to Why is low blood sugar a problem?
Return to Diabetes in children: Dealing with low blood sugar

Why is low blood sugar a problem?

If your child's blood sugar drops below 40 mg/dL, his or her brain may receive too little sugar to work properly, and judgment and muscle coordination will be affected. Your child may not recognize low blood sugar and may not be aware that he or she needs to eat. You or someone else may have to help your child eat or drink something to raise the blood sugar level.

If your child's blood sugar level continues to drop below 20 mg/dL, he or she can lose consciousness and possibly die.

A low blood sugar level may soon recur, even though it has been treated. For example, some sulfonylurea medicines can continue to lower blood sugar levels for up to 24 hours. If your child's blood sugar level drops to a low level, check it frequently for some time after the low level has been treated.

Test Your Knowledge

1. If my child's blood sugar level drops very low (below 20 mg/dL):
1. He or she can fall into a coma and possibly die.
   

   The answer is correct

   A very low blood sugar level (below 20 mg/dL) is an emergency, and your child will need care immediately. If your child does not receive immediate care, a very low blood sugar level can lead to coma and death.

   
2. My child will seem normal.
   

   The answer is incorrect

   If your child's blood sugar level drops to 20 mg/dL or lower, he or she will not seem normal. The correct answer is a. A very low blood sugar level (below 20 mg/dL) is an emergency, and your child will need care immediately. If your child does not receive immediate care, a very low blood sugar level can lead to coma and death.

   
3. My child will be able to eat or drink something to raise it.
   

   The answer is incorrect

   If your child's blood sugar level drops to 20 mg/dL or lower, he or she will not be able to eat or drink something to raise it. The correct answer is a. A very low blood sugar level (below 20 mg/dL) is an emergency, and your child will need care immediately. If your child does not receive immediate care, a very low blood sugar level can lead to coma and death.

   

Continue to How do you deal with low blood sugar?
Return to Diabetes in children: Dealing with low blood sugar

How do you deal with low blood sugar?

Here are some ways you can manage a low blood sugar emergency.

Be prepared

• Keep some quick-sugar food with your child at all times. It can raise your child's blood sugar level 30 mg/dL in 15 minutes.
• Know the symptoms of low blood sugar. Post a list of these symptoms where you and your child will see it often. Have your child carry a copy at all times. Add any symptoms you have noticed in your child that are not on the list. The child may not always have the same symptoms.
• Have your child wear medical identification, such as a medical alert bracelet. People will know that your child has diabetes and can get help in case your child's blood sugar drops very low. See the Where to Go From Here section below to learn where to purchase medical identification.
• Teach your child's caregivers how to check blood sugar. Have instructions with the blood sugar meter.
• Post the emergency care for low blood sugar instructions in a convenient place at home and at school.

Treat low blood sugar early

Check your child's blood sugar if you think it may be low, even if you don't see any symptoms. If your child's blood sugar level is below 70 mg/dL:

• If your child is alert, give him or her some quick-sugar food. Liquids will raise your child's blood sugar faster than solid foods.
  • Check your child's blood sugar after 5 minutes. It will take about 5 minutes for the sugar in the food to get into your child's bloodstream.
  • Wait another 5 to 10 minutes and check your child's blood sugar level again. If his or her blood sugar is still below 70 mg/dL, have your child eat or drink something that contains sugar, such as milk.
• If your child is not alert, follow the appropriate guidelines:
  • If your child does not take insulin injections, see emergency care for a child with low blood sugar who takes only oral diabetes medicine.
  • If your child takes insulin, see emergency care for a child with low blood sugar who takes insulin.

After the episode

• When your child's blood sugar has returned to above 70 mg/dL, feed him or her a regular meal or a snack, such as a turkey sandwich. This will help keep his or her blood sugar from dropping again.
• Write down your child's symptoms and what you did. Use the low blood sugar level record(What is a PDF document?) .
• Let your child's doctor know if your child is having frequent low blood sugar problems. His or her medicine may need to be adjusted or changed.

Test Your Knowledge

1. To be prepared for a low blood sugar emergency, your child needs to carry:
1. His or her oral medicines for diabetes.
   

   The answer is incorrect

   To be prepared for a low blood sugar emergency, always have some quick-sugar food with your child. The correct answer is b. Review the list of quick-sugar foods.

   
2. Some quick-sugar food.
   

   The answer is correct

   To be prepared for a low blood sugar emergency, always have some quick-sugar food with your child. Review the list of quick-sugar foods.

   
2. To treat low blood sugar before it becomes an emergency, your child needs to:
1. Take an extra pill for diabetes.
   

   The answer is incorrect

   An extra dose of your child's medicine will cause his or her blood sugar to drop lower. The correct answer is b. Having your child eat some food that contains sugar will raise his or her blood sugar level and prevent an emergency.

   
2. Eat some food that contains sugar.
   

   The answer is correct

   To treat low blood sugar before it becomes an emergency, your child needs to eat some food that contains sugar. Food that contains sugar will raise your child's blood sugar level and prevent an emergency.

   

Continue to Where to go from here
Return to Diabetes in children: Dealing with low blood sugar

Where to go from here

Now that you have read this information, you and your child are ready to start dealing with low blood sugar levels effectively.

Talk with your child's doctor

If you have questions about this information, take it with you and discuss it with the doctor. You may want to mark areas or make notes in the margins where you have questions.

If you would like more information on diabetes in children, the following resources are available:

Medical identification jewelry can be purchased at most pharmacies. Talk with your doctor or contact the local American Diabetes Association about other places to purchase medical identification.

Organization

Return to Diabetes in children: Dealing with low blood sugar