High blood sugar, also called hyperglycemia, can signal underlying issues like diabetes or prediabetes. Extremely high blood sugar levels can be dangerous and require medical attention. Here are 14 common symptoms to watch for:
- Frequent urination (polyuria) – The body tries to remove excess glucose through urine.
- Excessive thirst (polydipsia) – Often accompanies frequent urination.
- Extreme hunger (polyphagia) – Cells aren’t getting enough glucose despite high blood sugar.
- Unexplained weight loss – The body may break down fat and muscle for energy.
- Fatigue – Energy cannot be properly used by cells.
- Blurred vision – High glucose levels can pull fluid from eye lenses, affecting focus.
- Slow-healing sores or cuts – High sugar can impair circulation and immune function.
- Frequent infections – Especially urinary tract and skin infections.
- Dry mouth and skin – Due to dehydration from excess urination.
- Nausea or vomiting – Can indicate very high glucose or diabetic ketoacidosis (DKA).
- Headaches – Caused by dehydration or changes in blood glucose.
- Irritability or mood changes – Blood sugar swings affect brain function.
- Tingling or numbness in hands and feet (neuropathy) – Long-term high sugar can damage nerves.
- Fruity-smelling breath – Often a sign of DKA, a medical emergency.
⚠️ Important: If you experience persistent symptoms or blood sugar readings above 180 mg/dL (post-meal) or 250 mg/dL (fasting), see a healthcare provider immediately. Severe hyperglycemia can lead to life-threatening complications.
If you want, I can also explain the causes behind each symptom so you understand why high blood sugar affects the body this way. Do you want me to do that?
