Symptoms of High Blood Sugar - Topic Overview
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.
Mild high blood sugar
If your blood sugar levels are
consistently 200 milligrams per deciliter (mg/dL) to 350 mg/dL, 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:
- Increased thirst.
- Increased urination.
- Weight loss.
- Increased appetite.
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. Children have mild high blood sugar when their blood sugar levels are between 200 mg/dL and 240 mg/dL.
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
Moderate to severe high blood sugar
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:
- Blurred vision.
- Extreme thirst.
- Flushed, hot, dry skin.
- Restlessness, drowsiness, or difficulty waking up.
If your body produces little or no insulin (people with
type 1 diabetes and some people with
type 2 diabetes), you also may have:
- Rapid, deep breathing.
- A fast heart
rate and a weak pulse.
- A strong, fruity breath odor.
- Loss of appetite, belly pain, and/or
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.