High blood sugar symptoms can be easy to miss at first. You may feel thirstier than usual, need to urinate more often, or notice that your energy is fading. These changes can develop gradually, and some people have no obvious warning signs at all. Recognizing symptoms early—and checking your glucose rather than guessing—can help you take the right next step.
Hyperglycemia, or high blood sugar, happens when glucose builds up in the bloodstream because the body doesn’t have enough effective insulin. It can affect people with type 1, type 2, or gestational diabetes. Illness and certain medications can also raise blood sugar, including in people without a diabetes diagnosis.
Frequent urination and intense thirst often appear together. When glucose levels are high, the kidneys work to remove excess sugar through urine, taking fluid with it. That fluid loss can leave you dehydrated and thirsty. Other possible signs include fatigue, blurred vision, slow-healing cuts, and repeated infections. Unexplained weight loss can happen when the body can’t use glucose properly and begins breaking down fat for energy.
Symptoms alone cannot confirm hyperglycemia. A blood glucose meter, continuous glucose monitor, or laboratory test is the reliable way to know your level. Very high blood sugar can lead to diabetic ketoacidosis or hyperosmolar hyperglycemic state—serious conditions that need urgent medical care. Repeated vomiting, deep or rapid breathing, fruity-smelling breath, confusion, or difficulty staying awake are emergency warning signs.
What causes blood sugar to rise, and how can you respond safely? Read on to learn how high blood sugar is diagnosed, which symptoms need urgent attention, and what steps can help prevent recurring highs.
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