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Fruity-Smelling Breath: If hyperglycemia becomes severe and is left untreated, your body may start burning fat for energy, producing a byproduct called ketones. This can lead to a sweet, fruity odor on your breath.Nausea and Vomiting: A buildup of ketones in your blood can also lead to diabetic ketoacidosis (DKA), a serious condition that causes nausea, vomiting, and abdominal pain.Headaches: Elevated blood sugar levels can affect your brain and cause frequent or severe headaches.Difficulty Concentrating: High blood sugar can lead to confusion and difficulty concentrating, as your brain is not getting the glucose it needs to function properly
