Very High Blood Glucose: Signs & Symptoms
Very high blood glucose means too much sugar in the blood. This can happen in diabetes when the body does not make enough insulin or cannot use insulin properly.
High glucose pulls water out through urine, causing dehydration and weakness. If severe, it can become a medical emergency.
Common signs and symptoms
- Extreme thirst
- High sugar causes dehydration and makes the person feel very thirsty.
- Frequent urination
- The body tries to remove extra glucose through urine.
- Dry mouth: Fluid loss can make the mouth feel very dry.
- Blurred vision: High glucose can temporarily affect the eye lens and vision.
- Fatigue and weakness: Cells may not use glucose properly, causing low energy.
- Nausea or vomiting: Very high glucose can upset the stomach and may signal danger.
- Unexplained weight loss: The body may break down fat and muscle for energy when glucose cannot be used well.
Danger warning signs
- Confusion or drowsiness: Mental changes may suggest severe hyperglycemia and need urgent care.
- Deep or fast breathing: This can be a warning sign of diabetic ketoacidosis, especially in type 1 diabetes.
- Fruity breath smell: Fruity or acetone-like breath can happen when ketones are high.
- Repeated vomiting: Vomiting can quickly worsen dehydration and electrolyte imbalance.
- Ketones present: Positive ketones need urgent medical advice, especially in type 1 diabetes.
When to seek urgent help
- Get medical help immediately if there is:
- Repeated vomiting
- Deep or fast breathing
- Fruity breath smell
- Severe weakness
- Confusion or drowsiness
- Very high glucose reading not improving
- Positive ketones
- Signs of severe dehydration
Key message
Very high blood glucose can cause thirst, frequent urination, dry mouth, blurred vision, weakness, nausea, and weight loss. If vomiting, confusion, ketones, fruity breath, or breathing changes occur, it may be an emergency and should not be ignored.
Medical Disclaimer:
This information is for general health education only and is not a substitute for medical advice, diagnosis, or treatment. Please consult a qualified healthcare professional for blood sugar management. Seek urgent medical care for very high glucose with vomiting, ketones, confusion, severe weakness, fruity breath, deep breathing, dehydration, or worsening symptoms.
