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High blood sugar, which affects people who have diabetes.

Check blood sugar as often as a health care professional recommends. Get regular exercise. Take any diabetes medicines as prescribed. Eat a balanced diet with smaller portions and less sugar.

Seek emergency help if a person with hyperglycemia has:

• Ongoing vomiting or diarrhea, and can't keep down food or liquids.
• Blood sugar levels that stay above 240 milligrams per deciliter (mg/dL).
• Acids called ketones in the urine, found with an at-home urine ketones test kit.

Make an appointment to see a health care professional if the person has:

• Ongoing diarrhea or vomiting, but can keep down some food or drinks.
• A fever that lasts longer than 24 hours.
• Blood sugar levels that stay above 240 mg/dL despite treatment, along with ketoacidosis symptoms such as extreme thirst and urinating often.
• Trouble keeping blood sugar within the prescribed target range.