If you’re referring to the “12 signs your body is warning you about high blood sugar” claim, there are some legitimate symptoms—but they do not prove that your blood sugar is high, and many people with type 2 diabetes have few or no symptoms.
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NIDDK
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12 possible warning signs
Frequent urination, including getting up repeatedly at night
Unusual thirst or a persistently dry mouth
Increased hunger, even after eating
Unexplained weight loss
Persistent fatigue or weakness
Blurred vision
Slow-healing cuts or sores
Frequent urinary, skin, or yeast infections
Tingling, numbness, or pain in the hands or feet
Dry or itchy skin
Mood changes or irritability
Headaches, which can occur with hyperglycemia but are nonspecific.
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NIDDK
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The important part
Symptoms aren’t a reliable way to determine your blood sugar. An A1C or blood-glucose test is needed to diagnose diabetes or prediabetes. A home glucose meter can help monitor glucose but isn’t sufficient by itself to diagnose diabetes.
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NIDDK
🚨 Very high blood sugar can become an emergency. Severe thirst and urination accompanied by vomiting, abdominal pain, fruity-smelling breath, rapid/deep breathing, confusion, or extreme weakness can indicate diabetic ketoacidosis (DKA), which requires immediate medical care.
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CDC
Bottom line: If several of these symptoms are new or persistent—especially thirst, frequent urination, unexplained weight loss, or blurred vision—getting your blood glucose and A1C checked is much more useful than trying to interpret symptoms alone.
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