12 possible signs of high blood sugar

High blood sugar (hyperglycemia) can happen when the body does not make enough insulin or cannot use insulin effectively. Symptoms may develop gradually and are not always obvious.

1. Increased thirst

Feeling unusually thirsty and needing to drink more fluids can happen as the body tries to remove excess glucose.

2. Frequent urination

High blood sugar can cause the kidneys to work harder, leading to more trips to the bathroom, especially at night.

3. Increased hunger

Some people feel very hungry because glucose is not entering cells properly to provide energy.

4. Unexplained tiredness

Fatigue can occur when the body cannot efficiently use sugar for energy.

5. Blurred vision

Changes in blood sugar can affect the lenses of the eyes and cause temporary vision changes.

6. Slow-healing cuts or wounds

High blood sugar can affect circulation and the body’s ability to repair tissues.

7. Frequent infections

People with persistently high blood sugar may be more prone to certain infections.

8. Tingling or numbness

Nerve irritation or damage related to diabetes can cause sensations in the hands or feet.

9. Unexplained weight loss

Some people lose weight when the body starts using fat and muscle for energy because glucose cannot be used properly.

10. Dry mouth or itchy skin

Dehydration and circulation changes can contribute to these symptoms.

11. Mood changes or difficulty concentrating

Blood sugar fluctuations may affect energy levels and mental clarity.

12. Fruity-smelling breath, nausea, or severe weakness

These can be signs of a serious condition called diabetic ketoacidosis (DKA), which requires urgent medical attention.

When to check your blood sugar

Consider speaking with a healthcare professional if you have symptoms, especially if you also have risk factors such as:

• Family history of diabetes
• Overweight or obesity
• High blood pressure
• History of gestational diabetes
• Sedentary lifestyle

A blood test (such as fasting glucose or HbA1c) is needed to diagnose diabetes—symptoms alone cannot confirm it.