Early Signs and Symptoms of Type 2 Diabetes

Type 1 diabetes tends to announce itself quickly and dramatically. Type 2 diabetes is different. Blood sugar usually rises so slowly that the body adapts, and people put small changes down to getting older, being busy or sleeping badly. Many people are diagnosed only after a routine blood test, or when a complication such as an eye or foot problem is found.

That is why knowing the signs matters, and why testing matters even more.

Why symptoms happen

When blood sugar climbs well above normal, the kidneys cannot reabsorb all of it. Glucose spills into the urine and pulls water with it. That leads to more urine, then thirst as the body tries to replace the lost fluid. Meanwhile, because glucose is not getting into the cells efficiently, you may feel tired and hungry even after eating. Over time, high glucose also affects the lens of the eye, the immune system and small nerves.

The signs to watch for

Let us look at each in a little more detail.

• Increased thirst and passing more urine. Getting up at night to pass urine more than usual is often the first thing people notice.
• Tiredness. Feeling drained, especially after meals, is common and easy to dismiss.
• Increased hunger despite eating normally, and sometimes unexplained weight loss. Weight loss without trying suggests blood sugar is quite high and should be checked promptly.
• Blurred vision that comes and goes, caused by fluid shifting in the lens of the eye. It usually settles once blood sugar improves.
• Slow-healing cuts or sores, and repeated infections such as thrush (yeast infections), urinary infections, skin infections or gum disease.
• Tingling, burning or numbness in the feet or hands, a sign that nerves may already be affected.
• Dark, velvety skin in body folds (acanthosis nigricans), which signals insulin resistance. Small skin tags often appear with it.

The silent majority

Many people with type 2 diabetes have none of these symptoms, or such mild ones that they do not notice. Symptoms usually appear only once blood sugar is well above the diagnostic threshold. That means feeling well is not proof that your blood sugar is normal.

Sources: CDC NCHS Data Brief 516 (2024); IDF Diabetes Atlas, 11th edition (2025).

Prediabetes is even quieter and usually causes no symptoms at all. If you are curious about the earlier stage, see Signs and Symptoms of Prediabetes.

When to see a doctor

Book an appointment and ask for a blood sugar test if you notice any of the symptoms above, especially if you also have risk factors such as age over 35, a family history, or extra weight around the middle. See Type 2 Diabetes Risk Factors for the full list.

Common questions