Overview
Type 1 diabetes is an autoimmune condition. The body’s immune system attacks the cells in the pancreas that make insulin, a hormone that helps glucose move from the blood into the body’s cells for energy. Without enough insulin, blood sugar becomes too high and the body cannot use food normally.
Key Symptoms
Common symptoms include unusual thirst, frequent urination, weight loss, tiredness, blurry vision, and increased hunger. Some people also have nausea, vomiting, stomach pain, or fruity-smelling breath, especially if diabetic ketoacidosis is developing. Symptoms often appear quickly compared with type 2 diabetes.
Causes and Risk Factors
Type 1 diabetes is caused by an autoimmune process, but the exact reason this starts is not fully understood. Genes play a role, and environmental triggers such as infections may also be involved. It is not caused by eating sugar, lack of exercise, or being overweight.
Who Is Affected
Type 1 diabetes can develop at any age, including in adults. It is often diagnosed in children, teenagers, and young adults, but older adults can also develop it. A family history of type 1 diabetes or other autoimmune conditions may increase risk, though many people diagnosed have no close relative with it.
Prevention
There is currently no known way to prevent most cases of type 1 diabetes. Researchers are studying why the immune system attacks insulin-making cells and whether some cases can be delayed in people at high risk. People with a strong family history may wish to ask a healthcare professional about risk screening or research programs where available.
Diagnosis and Tests
Healthcare professionals diagnose type 1 diabetes using blood glucose testing and other lab tests. These may include HbA1c, ketone testing, and tests for autoantibodies that suggest an autoimmune cause. Because symptoms can become severe quickly, prompt medical assessment is important if type 1 diabetes is suspected.
Treatment Categories
Treatment includes lifelong insulin therapy, regular blood glucose monitoring, education on managing highs and lows, and ongoing medical follow-up. Some people use insulin pens or syringes, while others use insulin pumps and continuous glucose monitors. Treatment plans are individualized and may change over time, especially during illness, growth, pregnancy, or changes in daily routine.
Living With It
Living with type 1 diabetes involves balancing insulin, food, physical activity, stress, and illness. People may need support with school, work, travel, sleep, and emotional health. Regular checkups help monitor blood sugar patterns and screen for complications affecting the eyes, kidneys, nerves, heart, and feet.
Diet and Lifestyle
There is no single diabetes diet that fits everyone, but regular meals, understanding carbohydrate intake, and staying active are important parts of care. Physical activity can affect blood sugar before, during, and after exercise, so planning is often needed. Alcohol, illness, and skipped meals can also change blood sugar and should be discussed with a healthcare professional.
When to Seek Medical Care
Seek medical care promptly for possible symptoms of type 1 diabetes, especially sudden thirst, frequent urination, weight loss, tiredness, or blurry vision. People already diagnosed should contact a healthcare professional if blood sugar is often too high or too low, if they are vomiting, cannot keep fluids down, have ketones, or are unsure how to manage illness. Children with possible symptoms should be assessed without delay.
When It May Be an Emergency
Get emergency help right away for signs of diabetic ketoacidosis or severe illness. Warning signs include deep or fast breathing, vomiting, stomach pain, fruity-smelling breath, confusion, extreme sleepiness, dehydration, or loss of consciousness. Severe low blood sugar with seizure, inability to swallow, or unresponsiveness is also an emergency.