If by “high sugar” you mean
high blood glucose (hyperglycemia), there are several symptoms your body may
show. However, symptoms alone cannot diagnose diabetes—you need a blood-glucose test.
12 common signs of high blood sugar
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Frequent urination — excess glucose causes the kidneys to pull more water into the urine.
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Increased thirst — urinating more can leave you dehydrated.
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Increased hunger — glucose may be abundant in the blood but not being used effectively by cells.
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Unexplained weight loss — particularly when blood sugar remains very high.
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Tiredness or weakness — cells may not be getting enough usable energy.
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Blurred vision — high glucose can temporarily affect the eye’s focusing system.
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Slow-healing cuts or wounds — particularly important when accompanied by diabetes.
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Frequent infections — including urinary, skin, or genital infections.
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Tingling or numbness in the hands or feet — more commonly associated with prolonged diabetes-related nerve damage.
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Dry or itchy skin — dehydration and other effects of high glucose can contribute.
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Headaches or difficulty concentrating — can occur when glucose is significantly elevated or fluctuating.
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Nausea or vomiting — especially when blood glucose is very high; this can be a warning sign of a serious complication.
When it becomes an emergency
Very high blood sugar with vomiting, abdominal pain, rapid/deep breathing, severe weakness, confusion, or unusual drowsiness can indicate diabetic ketoacidosis (DKA) and requires emergency medical attention.
One important point: you can have diabetes or prediabetes without noticeable symptoms. If you’re concerned about your blood sugar, an HbA1c and/or fasting blood-glucose test is much more useful than trying to identify symptoms.
If you want, I can also explain the 12 symptoms one by one and tell you which ones usually appear first and what blood-sugar levels are considered dangerous.
