People with overly high blood sugar experience intense thirst, urinate frequently, have dry skin and experience frequent hunger, according to the New York State Department of Health. Other things that happen with hyperglycemia are blurry vision, tiredness and wounds that take too long to heal.
The consequences may be serious if hyperglycemia is not treated quickly, says the New York State Department of Health. Ketoacidosis, a diabetic coma, may result. Symptoms of that are shortness of breath, fruity-smelling breath, vomiting, nausea and an excessively dry mouth. A doctor should be consulted as soon as possible. While exercising frequently lowers blood sugar levels, a person should never exercise if his urine has ketones, which can be a precursor to ketoacidosis. Exercising with ketones pushes blood sugar levels even higher.
Infections and stress are two causes of elevated blood sugar, according to WebMD; therefore, people should test their blood levels and stay on medications even if they are stressed or sick. Excessively high blood sugar may also make a person feel faint. If blood sugar levels exceed 300 milligrams per deciliter after being checked two times in a row, a doctor needs to be alerted. Adjustments in insulin shots, diabetes pills, diet and exercise plans may be needed.