Type 1 diabetes is a lifelong disease that happens when the pancreas stops making enough of a hormone called insulin.
Insulin helps your body use sugar from your food as energy or store it for later use. If you don’t have insulin, too much sugar stays in your blood. Without insulin, sugar can't get into the cells and your blood sugar gets too high. Over time, high blood sugar can lead to problems with your eyes, heart, blood vessels, nerves and kidneys.
Type 1 diabetes can occur at any age, but it usually starts in children or young adults. It's a lifelong disease, but you can live a long and healthy life with treatment and a healthy lifestyle.