What are the warning signs of high blood sugar?

High blood sugar (hyperglycemia) commonly causes frequent urination, excessive thirst, and increased hunger even after eating. You may also experience blurred vision, fatigue, and headaches. Other warning signs include slow-healing cuts or sores, frequent infections, and unexplained weight loss. In more severe cases, you might notice fruity-smelling breath, nausea, vomiting, or confusion, which can indicate diabetic ketoacidosis, a serious condition requiring immediate medical attention. These symptoms can develop gradually, making them easy to overlook. People with diabetes should monitor their blood sugar regularly, as levels can rise without obvious symptoms. If you experience several of these signs, especially if you have risk factors for diabetes, consult a doctor promptly.