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Short Summary
Main recommendation: Do not rely on how you feel to judge blood sugar; check it directly, especially if you have symptoms such as frequent urination, thirst, fatigue, headache, or blurry vision. Dr. Ahmed Ergan, an endocrinologist, explains that these symptoms can signal high blood sugar and that untreated high levels can progress to diabetic ketoacidosis.
Key Points
- Feelings are unreliable: Dr. Ergan says people often guess wrongly about their blood sugar, so measuring it is the only dependable check.
- Frequent urination and thirst: Blood sugar staying above about 220 causes the kidneys to spill sugar into the urine, which pulls water along and leads to heavy urination and constant thirst.
- Fatigue and headache: When the body cannot use the glucose in the blood, muscles tire; the brain also depends on glucose, and both high levels and sudden drops (fluctuations) can trigger headaches.
- Blurry vision: High sugar can cause the eye lenses to swell, which blurs vision. Dr. Ergan says this is reversible and not blindness.
- Diabetic ketoacidosis (DKA): The advanced, serious stage. It mainly occurs in type 1 diabetes but can also occur in type 2, especially with certain drugs or prolonged high blood sugar.
Details Worth Noting
- Concrete instructions: If you have not checked your blood sugar and feel any of these symptoms, check your blood sugar or get tested rather than relying on feelings.
- Concrete instructions: Do not ignore these symptoms; act on them. If you feel excessive urination, thirst, headache, weakness, tiredness, or blurred vision, get your blood sugar checked.
- Concrete instructions: Watch for DKA warning signs, including nausea, abdominal pain, vomiting, fruity-smelling breath (like spoiled fruit), weakness, confusion, and rapid breathing.
- Dr. Ergan explains the mechanism behind DKA as glucotoxicity: persistently high glucose can paralyze the pancreas so it stops making insulin.
- Sudden drops in blood sugar can cause headaches even when the level is not high, especially for people who usually run at 200 or 300. Fluctuations matter, not only high readings.
- Some people's eyes are very sensitive to glucose changes, so blurry vision may appear sooner than other symptoms for them.
Bottom Line
Symptoms like heavy urination, constant thirst, fatigue, headache, and blurred vision are reasons to measure blood sugar rather than guess, since untreated high levels can progress to dangerous DKA. This is Dr. Ergin's educational explanation based on his clinical experience, not individual medical advice.
