High blood sugar (hyperglycemia) can sometimes develop gradually, and the symptoms may be easy to overlook. Recognizing possible warning signs can help people seek testing and care when needed.
12 Possible Signs of High Blood Sugar
- Increased thirst
- Feeling unusually thirsty even after drinking fluids.
- Frequent urination
- Needing to urinate more often, especially at night.
- Increased hunger
- Feeling hungry even after eating.
- Unexplained weight loss
- Losing weight without trying can occur when the body cannot properly use glucose for energy.
- Fatigue or low energy
- Feeling unusually tired or weak.
- Blurred vision
- High glucose levels can affect the fluid balance in the eyes.
- Slow-healing cuts or wounds
- Wounds may take longer to heal.
- Frequent infections
- Some people experience more frequent skin, urinary, or yeast infections.
- Tingling or numbness
- Nerve symptoms, especially in the hands or feet, can occur with prolonged high blood sugar.
- Dry mouth or dry skin
- Dehydration from increased urination can contribute to dryness.
- Difficulty concentrating
- Blood sugar changes may affect mental focus and energy.
- Mood changes
- Irritability or changes in mood can occur with fluctuating glucose levels.
These symptoms do not always mean diabetes—they can have other causes. The only way to know your blood sugar status is through testing, such as a fasting blood glucose test or HbA1c test.
Seek urgent medical care if someone has very high blood sugar symptoms along with vomiting, severe weakness, confusion, difficulty breathing, or signs of dehydration, as these can indicate a serious condition.
