World Diabetes Day 2026: Diabetes can develop silently for years: Why one simple health check could help detect the risk early and prevent future complications

November marks American Diabetes Month, with World Diabetes Day falling on Saturday, Nov. 14, 2026. The International Diabetes Federation's theme for 2026 and 2027 is "Early Action on Diabetes." According to the CDC, about 40.1 million people in the U.S. (12%) had diabetes in 2023, and about 11 million adults with diabetes have not been diagnosed. Another 115.2 million adults have prediabetes, as reported by the CDC. Early diabetes symptoms include strong thirst, frequent urination, hunger, weight loss without trying, fatigue and blurry vision, but many people notice none of them.

According to the CDC, each symptom traces back to sugar building up in the blood instead of reaching the cells that need it. High blood sugar pulls more water through the kidneys, leading to frequent urination and strong thirst. Without enough working insulin, cells cannot use blood sugar, which causes the body to read that as starvation and trigger hunger signals. When cells cannot get glucose for energy, the body breaks down muscle and fat instead, causing weight to drop even with normal or increased eating. Cells short on fuel leave people tired even after a full night's sleep, while changing blood sugar moves fluid in and out of the eye's lens to cause blurry vision.

Too much sugar in the blood can also slow circulation and weaken the body's repair process, leading to slow-healing sores. Elevated glucose makes it harder for white blood cells to fight germs, causing skin, gum, urinary and yeast infections to return more often than usual. Over time, excess glucose can damage nerve fibers in a condition called peripheral neuropathy. Additionally, dark, velvety patches on the neck, armpits or groin, called acanthosis nigricans, are a sign of insulin resistance listed by the CDC.

Type 1 symptoms usually develop quickly, over days or weeks, though adults with Type 1 can have slower symptoms, according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Sometimes the first sign of Type 1 is diabetic ketoacidosis (DKA), which is a dangerous buildup of acids in the blood. Type 2 diabetes usually develops slowly over several years, and symptoms can be mild enough to miss. Prediabetes usually causes no clear symptoms and is found through blood testing, while gestational diabetes develops during pregnancy and is found through routine screening.

Two major guidelines differ slightly on when to start screening. The U.S. Preventive Services Task Force recommends screening adults ages 35 to 70 who are overweight or have obesity, and says testing every three years may be reasonable. The American Diabetes Association's Standards of Care in Diabetes 2026 recommends testing all adults starting no later than age 35, and advises testing earlier for adults with overweight or obesity plus at least one other risk factor. Anyone with several symptoms or risk factors should ask a primary care doctor about blood testing, while rapid symptoms need same-day attention.