Symptoms of High Blood Sugar (Hyperglycemia)
High blood sugar can develop gradually, and some people—especially with type 2 diabetes—may have few or no noticeable symptoms. (CDC Stacks)
Common warning signs
- 💧 Increased thirst
- 🚽 Frequent urination, including waking at night
- 😴 Unusual tiredness or weakness
- 👁️ Blurred vision
- ⚖️ Unexplained weight loss
- 🍽️ Increased hunger
- 👄 Dry mouth
- 🤢 Nausea, vomiting, or stomach pain when glucose is very high (CDC Stacks)
- 🦠 Recurring infections or slow-healing wounds can also occur with diabetes.
🚨 When it becomes an emergency
Very high blood sugar can lead to diabetic ketoacidosis (DKA) or another hyperglycemic crisis. Vomiting, abdominal pain, dehydration, rapid/deep breathing, confusion, or severe weakness require urgent medical attention, particularly in someone with diabetes. (Diabetes Surveillance System)
🩸 Don’t rely on symptoms alone
Symptoms cannot tell you reliably how high your blood sugar is. Testing blood glucose and/or getting an HbA1c test is the appropriate way to investigate diabetes.
Bottom line: Persistent thirst + frequent urination + fatigue or unexplained weight loss are particularly good reasons to get your blood sugar checked—but you can have diabetes without obvious symptoms. (CDC Stacks)
