Type 1 Diabetes
Sources consulted
This article is original patient-education content.
- WHO—Health topics A–Z(2024)
- NHS—Health A to Z(2024)
- CDC—Health topics(2024)
Based on international clinical guidelines
Overview
Type 1 diabetes is a condition where your pancreas stops making insulin. Insulin is a hormone that helps sugar from food enter your cells to be used for energy. Without insulin, sugar builds up in your blood instead of going into your cells.
Key facts
- It is an autoimmune condition — your immune system mistakenly attacks the cells in your pancreas that make insulin.
- It is not caused by eating too much sugar or by your lifestyle.
- People with type 1 diabetes need to take insulin every day for life.
- It can start at any age, but it is most often diagnosed in children, teenagers, and young adults.
Type 1 diabetes is less common than type 2 diabetes, but it still affects millions of people worldwide. About 5–10% of all diabetes cases are type 1.
It can happen at any age, but it most often appears in childhood or early adulthood. It affects people of all backgrounds equally.
Symptoms
- Deep, rapid breathing (your body is trying to get rid of extra acid in the blood)
- A fruity smell on your breath
- Severe confusion or acting drunk when you haven't had alcohol
- Vomiting or severe stomach pain
- Very high blood sugar (over 250 mg/dL or 13.9 mmol/L) with ketones in urine or blood
- ⚠Blood sugar levels that stay very high despite taking your insulin
- ⚠Persistent vomiting or diarrhea with inability to keep fluids down
- ⚠Signs of an infection that is not getting better
Common symptoms
- Needing to urinate (pee) a lot, especially at night
- Feeling very thirsty all the time
- Feeling very hungry even after eating
- Losing weight without trying
- Feeling very tired or weak
- Blurred vision
Symptoms in children
- Wetting the bed after having been dry at night
- Feeling irritable or moody
- Rapid weight loss
- Stomach aches or vomiting
Symptoms in older adults
- Confusion or drowsiness
- Recurrent infections, such as skin or urinary tract infections
- Slow-healing cuts or bruises
Causes
Main causes
- Type 1 diabetes is caused by an autoimmune reaction where the body's immune system attacks and destroys the insulin-making cells (beta cells) in the pancreas.
- The exact reason why this happens is not fully understood. It is likely a combination of genes and something in the environment, like a virus.
Risk factors
- Having a close family member with type 1 diabetes
- Certain genes that increase the risk of the immune system attacking the pancreas
- Exposure to certain viral infections (for example, some enteroviruses) in childhood
When to see a doctor
See a doctor urgently if:
- Seek emergency care if you or your child has symptoms of diabetic ketoacidosis (see emergency symptoms above).
- If you have a very high blood sugar reading and cannot reach your healthcare team, call your local emergency number.
Book a routine appointment if:
- Make an appointment with a healthcare provider if you or your child has any of the common symptoms listed above, especially increased thirst and frequent urination.
- If you have a family history of type 1 diabetes and notice any symptoms, get checked early.
Diagnosis
A healthcare provider will diagnose type 1 diabetes with blood tests that check your blood sugar levels. They may also test for specific antibodies to confirm it is type 1 and not another type of diabetes.
Tests that may be done
- Fasting blood sugar test: Your blood sugar is measured after you have not eaten for at least 8 hours.
- A1C test: This shows your average blood sugar levels over the past 2–3 months.
- Random blood sugar test: A blood sugar test taken at any time, regardless of when you last ate.
- Antibody tests: These look for markers that tell if your immune system has attacked your pancreas.
What to expect at your appointment
If your healthcare provider suspects diabetes, they will take a blood sample and send it to a lab. You will likely need to come back for the results. If the diagnosis is confirmed, you will be referred to a diabetes care team for education and treatment planning.
Treatment
Type 1 diabetes requires lifelong management. The main treatment is replacing the insulin your body cannot make. This is done through injections or an insulin pump. You will also need to check your blood sugar regularly and balance your food and activity levels.
Self-care at home
- Check your blood sugar levels several times a day using a glucose meter or continuous glucose monitor.
- Take your insulin as prescribed — either by injections or through a pump.
- Count carbohydrates in meals to match insulin doses.
- Test for ketones when your blood sugar is high, especially if you feel unwell.
- Carry a fast-acting sugar source (like glucose tablets or juice) in case of low blood sugar (hypoglycemia).
- Wear a medical alert ID that says you have diabetes.
Medical treatments
Insulin therapy is the cornerstone of treatment. It is given in two forms: a long-acting (basal) insulin to keep blood sugar stable between meals and overnight, and a short-acting (bolus) insulin to cover meals and correct high blood sugar. Some people use an insulin pump, which gives a steady flow of insulin. Your healthcare team will help you choose the best insulin delivery method and teach you how to adjust doses for food, exercise, and illness. Regular check-ups with your diabetes team are essential to monitor your blood sugar control and screen for complications.
When is surgery considered?
If you have surgery, your diabetes care will be managed closely. Your insulin doses may be adjusted beforehand, and your blood sugar will be monitored frequently during and after the procedure. Your healthcare team will give you specific instructions.
Living with this condition
Living with type 1 diabetes means making blood sugar management a regular part of your day. You will check your levels, take insulin, plan meals, and adjust for physical activity. It can feel overwhelming at first, but many people find a routine that works for them. You can still go to school, work, travel, and participate in sports — it just takes a little extra planning.
Lifestyle tips
- Keep a log of your blood sugar levels, insulin doses, and food to see patterns.
- Always have your diabetes supplies (insulin, testing kit, glucose tablets) with you.
- Tell close friends, family, and coworkers about your condition and how they can help in an emergency.
- Wear a medical ID bracelet or necklace.
- Plan ahead for travel: pack extra supplies, carry a doctor's letter, and know how to access care at your destination.
Diet and exercise
You can eat a balanced diet, but you need to match your carbohydrate intake with your insulin. A dietitian can help you learn to count carbs and plan meals. Exercise is important too — it helps your body use insulin better. But you may need to adjust your insulin or food before, during, or after activity to prevent low blood sugar.
Mental health and emotional wellbeing
Managing a chronic condition like type 1 diabetes can be stressful. It is common to feel frustrated, angry, or anxious. Some people experience 'diabetes burnout' — feeling exhausted by the constant demands. If you are struggling, please talk to your healthcare provider or a mental health professional. You are not alone. If you ever feel like harming yourself or have suicidal thoughts, call your local crisis helpline immediately.
Prevention
At this time, there is no known way to prevent type 1 diabetes. Researchers are studying ways to delay or stop the autoimmune attack, but no proven prevention method is available yet.
Complications
If left untreated
- Diabetic ketoacidosis (DKA) — a life-threatening emergency that happens when not enough insulin is present.
- Long-term high blood sugar can damage blood vessels and nerves, leading to:
- Eye disease (retinopathy) that can cause vision loss
- Kidney disease (nephropathy) that can lead to kidney failure
- Nerve damage (neuropathy) causing numbness, pain, or weakness in hands and feet
- Heart disease and stroke
Long-term outlook
With good blood sugar control and regular medical care, people with type 1 diabetes can live long, healthy lives. Many have successful careers, families, and active lifestyles. New technologies like continuous glucose monitors and insulin pumps make management easier. The key is staying on top of your health and working closely with your diabetes team.
Find support
International organisations
Local organisations
- Diabetes UK ↗ · United Kingdom
Helplines
External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.
Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.