Type 2 diabetes is a long-term condition in which blood glucose levels become too high because the body does not use insulin effectively, does not make enough insulin, or both. It is the most common form of diabetes and is usually managed through a mixture of lifestyle changes, monitoring, medicines and regular review.
Type 2 diabetes can develop slowly. Some people have clear symptoms, while others are diagnosed through routine blood tests or screening because they have risk factors. Early diagnosis matters because treatment can reduce the risk of complications affecting the heart, blood vessels, kidneys, eyes, nerves and feet.
Symptoms
Common symptoms include feeling very tired, passing urine more often than usual, feeling thirsty, and losing weight without trying. Other symptoms can include blurred vision, cuts or wounds taking longer to heal, itching around the genitals, and repeated thrush.
Symptoms may develop gradually and are sometimes missed. Not everyone with type 2 diabetes has symptoms, so people at higher risk may be advised to have blood tests even if they feel well.
Causes and Risk Factors
Type 2 diabetes is linked to insulin resistance and reduced insulin production. Risk is influenced by a mixture of age, family history, body weight, activity level, ethnicity and other health conditions.
In UK guidance, higher-risk groups include people who are overweight and not very physically active, people with a close relative with diabetes, people with high blood pressure, and people from South Asian, Chinese, Black African or Black Caribbean backgrounds at younger ages than the white population.
Gestational diabetes also raises later risk. Someone who has had diabetes during pregnancy should normally be followed up after birth and then checked regularly for type 2 diabetes.
Diagnosis
Diagnosis is made with blood tests that measure blood glucose control. Tests may include HbA1c, fasting plasma glucose or an oral glucose tolerance test depending on the situation.
In the NHS, a blood test is used to check how high the blood glucose level is. The result may also help distinguish type 2 diabetes from type 1 diabetes where the presentation is unclear.
Prediabetes means blood glucose is above the normal range but not high enough for a diabetes diagnosis. It is a warning sign that future diabetes risk is higher, and lifestyle support may be offered.
Treatment and Management
Management is usually individualised. Many people start with lifestyle changes, such as improving diet, increasing physical activity, losing weight where appropriate, stopping smoking, moderating alcohol intake, and attending diabetes education.
NHS advice says lifestyle changes can lower blood glucose and, for some people, may lead to remission. Diabetes courses are recommended so people understand monitoring, food choices, medicines, foot care, sick-day rules and when to ask for help.
Medicines may be needed if lifestyle change is not enough or if blood glucose is high at diagnosis. Common medicines include metformin, SGLT2 inhibitors, GLP-1 receptor agonists and insulin. Choice depends on blood glucose levels, weight, kidney function, cardiovascular risk, side effects, pregnancy plans, other conditions and patient preference.
Monitoring
Long-term follow-up normally includes HbA1c checks, blood pressure review, cholesterol and kidney checks, weight review, foot checks and diabetic eye screening. The timing depends on the person's health, treatment and previous results.
Monitoring is not only about blood sugar. Cardiovascular risk is a major part of type 2 diabetes care, so blood pressure, smoking, cholesterol and kidney health are also important.
Complications
Poorly controlled diabetes can damage blood vessels and nerves over time. Possible complications include heart disease, stroke, kidney disease, diabetic retinopathy, neuropathy, foot ulcers, infections and, in severe cases, amputation.
Good diabetes care aims to reduce these risks through blood glucose control, blood pressure control, cholesterol management, smoking cessation, foot care, eye screening and early treatment of problems.
Prevention and Remission
Type 2 diabetes can sometimes be delayed or prevented in people at high risk. Useful measures include weight loss where needed, regular physical activity, a balanced diet, reduced intake of highly processed sugary foods, and treatment of blood pressure and cholesterol.
Some people with type 2 diabetes can reach remission, meaning blood glucose returns below the diabetes range without glucose-lowering medicine. Remission is not the same as a permanent cure, so ongoing checks are still needed.
See Also
References
Discussion log
Use comments for sourcing notes, corrections, and disputed details.
No comments yet.