High blood sugar (hyperglycemia) can be sneaky at first, but your body often gives warning signs. Here are 12 common signs that your blood sugar might be too high:
Physical signs
- Frequent urination (polyuria) – Your kidneys try to get rid of extra sugar.
- Excessive thirst (polydipsia) – Dry mouth and constant thirst.
- Unexplained fatigue – Your cells aren’t getting sugar efficiently.
- Blurred vision – High glucose can temporarily change the shape of your eye lens.
- Headaches – Often linked to dehydration from frequent urination.
- Dry, itchy skin – Dehydration and poor circulation can cause this.
Digestive and metabolic signs
- Unexpected weight loss – Sugar isn’t used for energy properly, so your body burns fat/muscle.
- Increased hunger (polyphagia) – Cells are starving even if blood sugar is high.
- Slow-healing wounds – High glucose affects immune function and circulation.
- Frequent infections – Yeast infections, urinary tract infections, or gum infections can become more common.
Other signs
- Tingling or numbness in hands/feet (neuropathy) – High sugar over time can damage nerves.
- Mood changes – Irritability, anxiety, or confusion can appear if sugar swings are severe.
⚠️ When to seek help
- Blood sugar >300 mg/dL (16.7 mmol/L)
- Severe nausea, vomiting, fruity-smelling breath, or confusion → possible diabetic ketoacidosis (emergency).
Quick note: These signs can also appear in other conditions, so testing your blood sugar is the only way to know for sure.
If you want, I can make a simple chart showing what blood sugar ranges look like and when to worry, which makes it super easy to see the warning signs at a glance. Do you want me to do that?
