What are the warning signs of high blood sugar?

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High blood sugar announces itself in a characteristic cluster, driven by one mechanism: glucose above the kidney's threshold spills into urine, dragging water with it. The classic early signs: intense thirst that water barely touches, frequent urination including overnight trips, fatigue that sleep does not fix, and blurred vision that can fluctuate day to day as the eye's lens swells with shifting glucose. Add slow-healing cuts, recurrent infections - especially yeast - dry mouth, and unexplained weight loss when sugar is high enough that the body cannot use it for fuel. NIDDK lists this cluster as the presenting picture of diabetes, and it is worth knowing that type 2 often produces it so gradually that people adapt - which is why routine screening exists.

The emergency version: very high glucose with vomiting, deep rapid breathing, fruity-smelling breath, confusion, or severe dehydration is ketoacidosis - mostly a type 1 picture - and it is a call-now emergency, not a drive-yourself appointment.

What to do with the early cluster: do not self-diagnose and do not wait - a fasting glucose and A1c settle the question in one blood draw, per NIDDK, and early treatment changes everything downstream. The cluster in a child or teen moves faster - same-week testing at minimum, since type 1 presents acutely.

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What are the warning signs of high blood sugar?

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