前列腺癌筛查指南：预期、需要者和下一步

Overview

Type 1 diabetes is a chronic autoimmune condition in which the body’s immune system mistakenly attacks and destroys the beta cells in the pancreas that make insulin. Insulin is the hormone that helps move glucose (sugar) from the blood into cells for energy. Without enough insulin, blood sugar rises and can cause serious problems if not treated. Unlike type 2 diabetes, type 1 is not caused by lifestyle and cannot be prevented with diet or exercise alone. It often begins in childhood or young adulthood but can appear at any age. With modern insulin therapy and monitoring tools, people with type 1 diabetes can live long, healthy lives.

Signs & Symptoms

Symptoms usually develop quickly over days to weeks as insulin production falls. Common early signs include increased thirst and frequent urination as the body tries to flush out excess sugar. Other symptoms may appear as the condition progresses.

• Extreme thirst (polydipsia) and dry mouth
• Frequent urination, including at night
• Unexplained weight loss despite normal or increased appetite
• Increased hunger
• Fatigue or lack of energy
• Blurred vision
• Slow-healing cuts or frequent infections
• In children: bedwetting after being dry, irritability, or fruity-smelling breath

Causes & Risk Factors

Type 1 diabetes occurs when the immune system attacks pancreatic beta cells. The exact trigger is not fully known, but it involves a combination of genetic susceptibility and environmental factors such as certain viruses. It is not caused by eating too much sugar or lack of exercise.

• Family history of type 1 diabetes or other autoimmune conditions
• Presence of certain genes (such as HLA types) that increase risk
• Possible environmental triggers including viral infections
• Other autoimmune diseases (for example, thyroid disease or celiac disease) may co-occur
• Slightly higher risk in people of Northern European ancestry, though it affects all groups

Diagnosis

Diagnosis is based on blood tests that measure glucose levels and look for signs of autoimmune attack. A healthcare provider will also review symptoms and medical history. Early diagnosis helps prevent DKA and starts treatment promptly.

• Fasting blood glucose or random blood glucose test showing high levels
• Hemoglobin A1C test reflecting average blood sugar over 2–3 months
• Autoantibody tests (such as GAD, IA-2, or insulin autoantibodies) that confirm the autoimmune nature
• C-peptide test to assess remaining insulin production
• Urine tests for glucose or ketones if DKA is suspected

Treatment & Management

There is currently no cure for type 1 diabetes. Treatment focuses on replacing the missing insulin, keeping blood sugar in a target range, and preventing complications. Care is highly individualized and usually involves a diabetes care team (doctor, diabetes educator, dietitian).

• Insulin therapy: multiple daily injections or an insulin pump; types include rapid-acting, long-acting, and others
• Blood glucose monitoring: finger-stick checks or continuous glucose monitors (CGMs)
• Carbohydrate counting and meal planning to match insulin doses
• Regular physical activity with adjustments for blood sugar
• Screening for and managing related conditions (thyroid, celiac, eye, kidney, and nerve health)
• Education on recognizing and treating high and low blood sugar

Living With It

Living well with type 1 diabetes means building sustainable daily routines, staying connected with your care team, and addressing emotional health. Many people use technology such as CGMs and automated insulin delivery systems that make management easier. Support from family, friends, and diabetes communities can reduce stress. Regular check-ups help catch complications early. With consistent care, people with type 1 diabetes work, play sports, travel, have families, and enjoy full lives.