Diabetes mellitus is a chronic condition characterised by elevated blood glucose. Korea's diabetes prevalence has risen steadily, now affecting roughly 1 in 7 adults.
Diabetes is a group of metabolic diseases in which blood glucose (blood sugar) levels are too high over a prolonged period. This happens either because the pancreas doesn't produce enough insulin (Type 1), the body doesn't respond effectively to insulin (Type 2), or both. A third form, gestational diabetes, develops during pregnancy.
Korea's diabetes burden has grown alongside dietary shifts and an ageing population. According to the Korea Disease Control and Prevention Agency (KDCA), diabetes prevalence among adults over 30 is estimated at around 14–16% — driven by high-sodium and high-carbohydrate traditional diets, sedentary office work, and an ageing demographic. The Ministry of Health and Welfare (MOHW) runs national screening and diabetes management programmes through the National Health Insurance Service (NHIS) annual check-up system.
Type 2 diabetes is largely preventable and manageable through lifestyle changes including diet modification, regular exercise, weight management, and — when necessary — medication. Uncontrolled diabetes leads to serious complications including kidney disease, blindness, nerve damage, and cardiovascular disease.
Key Points
- Type 1 diabetes: autoimmune — the body destroys its own insulin-producing cells; usually diagnosed in childhood
- Type 2 diabetes: insulin resistance — the most common type, strongly linked to lifestyle factors
- Gestational diabetes: develops during pregnancy, usually resolves after birth but increases future T2D risk
- Pre-diabetes: blood glucose is elevated but not yet at diabetic levels — a critical intervention window
- HbA1c (glycated haemoglobin) test measures average blood sugar over 3 months — target under 7% for most diabetics
- NHIS national health screening includes free annual blood glucose testing for enrolled adults
Causes & Risk Factors
- Insulin resistance from obesity, physical inactivity, and poor diet (Type 2)
- Autoimmune destruction of pancreatic beta cells (Type 1)
- Genetic predisposition — family history significantly increases risk
- Age over 45 — risk increases with age
- Gestational diabetes in previous pregnancy
- PCOS (polycystic ovary syndrome) increases Type 2 risk in women
- Sedentary lifestyle — prevalent among Korea's office-working population
When to See a Doctor
- If you experience excessive thirst, frequent urination, unexplained weight loss, or extreme fatigue
- Annual screening for anyone over 40 in Korea, especially with risk factors
- Immediately if blood sugar is very high (above 20 mmol/L) or you feel confused or are vomiting
- For urgent review if blood sugar is very low (hypoglycaemia) — weakness, shaking, confusion
- If you have poorly controlled diabetes with recurring infections or slow wound healing
For emergencies in Korea, call 119
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This content is published for educational purposes only. For accurate diagnosis and personalised treatment, consult a licensed KMA physician in Korea.
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Medical Disclaimer
This article is published by DoctorsInKorea.com for educational and informational purposes only. It does not replace a professional clinical evaluation by a licensed healthcare provider. For accurate medical diagnosis and personalised treatment paths, please book an appointment with a licensed KMA physician. For immediate life-threatening medical emergencies in Korea, please call 119.
Sources & References
- Korea Ministry of Health and Welfare
- World Health Organization
- Korea Disease Control and Prevention Agency
- Korea National Health Insurance Service
- Mayo Clinic
- MedlinePlus (NIH)
Last reviewed: May 29, 2026