Lifestyle
7 Early Warning Signs of Type 2 Diabetes Many Adults Overlook
By Erica Coleman · October 21, 2026
About 38.4 million Americans had diabetes in 2021, and 8.7 million adults with it had not been diagnosed, according to federal estimates published by the National Institute of Diabetes and Digestive and Kidney Diseases. That means more than one in five adults with diabetes didn’t know they had it.
Type 2 is the most common form, and it is more common in older adults. The Mayo Clinic says its symptoms often come on slowly, and people can live with type 2 diabetes for years without knowing it. NIDDK says symptoms can be so mild that people might not even notice them, and some people first learn they have it when a complication such as nerve pain or vision loss shows up.
These seven signs appear on both the Mayo Clinic and NIDDK lists. Each is easy to blame on something else.
Thirst and more trips to the bathroom. Both sources list feeling very thirsty and urinating more often. Many people blame the bathroom trips on age or a nightly cup of tea.
Feeling hungry soon after a meal. NIDDK describes feeling very hungry, even after you have eaten.
Tiredness that doesn’t lift. Both sources list fatigue. Because it builds slowly, it can feel like a normal part of a busy or aging life.
Blurry vision. Both list blurred vision. It is easy to assume your glasses need updating.
Cuts and sores that heal slowly. A scrape on the shin that lingers for weeks is worth mentioning to a doctor.
Infections that keep coming back. NIDDK names urinary tract infections, skin infections, and yeast infections.
Numbness or tingling in the hands or feet. Mayo lists this as a symptom, and NIDDK lists pain, numbness, or tingling in the feet or hands among the problems that can lead to a diagnosis.
Mayo also mentions unexplained weight loss and patches of darker skin, most often in the armpits and on the neck.
Your risk rises with age, according to both sources, along with extra weight, especially around the waist, too little physical activity, and a family history of type 2 diabetes. NIDDK says people who are African American, American Indian, Asian American, Hispanic, Latino, or Pacific Islander are also more likely to develop it. Prediabetes, when blood sugar is higher than normal but not yet in the diabetes range, often progresses to type 2 if it isn’t addressed, Mayo says.
Catching it early matters because high blood sugar does its damage quietly. Mayo says that over time it can harm the heart, blood vessels, nerves, eyes, and kidneys, and that type 2 diabetes appears to raise the risk of dementia.
A simple blood test can answer the question. If you have Medicare, Part B covers up to two diabetes screenings a year if your doctor finds you are at risk, and you pay nothing if your provider accepts assignment. You qualify with one risk factor such as high blood pressure, abnormal cholesterol, obesity, or a history of high blood sugar. You also qualify with two of these: being 65 or older, being overweight, having a parent or sibling with diabetes, or having had diabetes during pregnancy. The screening can be a fasting or non-fasting glucose test or an A1C test.
If you notice any of these signs, NIDDK suggests talking with your primary care provider and asking whether you should be tested.
This article is for general information and is not medical advice. Talk with your doctor about any symptoms and before making changes to medicines, diet, or exercise. This article was produced with the assistance of AI and fact-checked against the sources cited by LightWave Reports.