In this article 8 sections
You may first hear about diabetes after a routine blood test, during pregnancy or when someone in your family receives a diagnosis. Understanding what happens in the body can make the diagnosis easier to understand and help you prepare for the care that follows.
What happens inside the body
Diabetes is a long-term condition in which blood glucose, also called blood sugar, becomes too high. It develops when the body does not make enough insulin or cannot use the insulin it makes effectively.
Glucose provides energy for the body. Insulin, a hormone produced by the pancreas, helps glucose move from the blood into cells. When this process does not work properly, glucose builds up in the bloodstream. Managing it matters because persistently high blood sugar can damage blood vessels and nerves over time.
The different types of diabetes
Type 1 diabetes develops when the immune system attacks the insulin-producing cells in the pancreas. The body then makes little or no insulin. It can begin in childhood or adulthood, and people with type 1 diabetes need insulin treatment to stay alive.
Type 2 diabetes develops when the body responds less effectively to insulin, a problem called insulin resistance. The pancreas may also become unable to make enough insulin. It is the most common type and can occur at different ages, including childhood. Treatment may include changes to daily habits, tablets, other injectable medicines or insulin, depending on the person's needs.
Gestational diabetes develops during pregnancy and needs care to protect both mother and baby. Blood sugar often returns to normal after delivery, but follow-up remains important because the mother has a higher risk of developing type 2 diabetes later.
You may also hear the term prediabetes. This means blood sugar is higher than normal but below the level used to diagnose type 2 diabetes. It signals an increased risk, although developing diabetes is not inevitable. Appropriate food choices, physical activity and weight management, where needed, can help prevent or delay its development.
Symptoms and risk factors
Diabetes can cause increased thirst, frequent urination, unusual tiredness, blurred vision or weight loss without trying. Some people notice that cuts heal slowly or that infections keep returning. These changes deserve a medical assessment, although symptoms alone cannot confirm diabetes.
Type 2 diabetes can develop gradually, and its symptoms may be mild or absent. Feeling well therefore does not always mean blood sugar is within a healthy range. Testing can identify a problem before someone notices changes in their health.
The reasons diabetes develops differ between types. For type 2 diabetes, risk is influenced by factors such as family history, age, physical activity, body weight and a previous pregnancy affected by gestational diabetes. Some of these factors can be changed and others cannot; care should consider the person's circumstances.
How is diabetes diagnosed
Doctors use blood tests together with symptoms and medical history. A fasting plasma glucose test measures blood sugar after fasting, while HbA1c reflects average blood sugar over approximately the previous three months. HbA1c helps show a longer-term pattern rather than the level at a single moment.
Other tests include an oral glucose tolerance test, which measures the body's response to a measured glucose drink, and a random plasma glucose test, which may be used when symptoms are present. A doctor may repeat a test or use another test to confirm the diagnosis. Pregnancy and certain other conditions can affect which test is suitable.
A home glucose meter can be useful for monitoring when recommended by a healthcare professional. However, a home reading alone does not establish a diagnosis.
What does living with diabetes involve
Daily care depends on the type of diabetes, the treatment prescribed and the person's wider health. Food choices, meal patterns and physical activity all play a part. A practical plan should fit the person's routine and abilities, while also making room for sleep, emotional wellbeing and the support they need.
Medicines should be taken as prescribed, including when someone feels well. The healthcare team can explain whether glucose checks are needed, how often to check and which results should prompt a call for advice. Treatment and monitoring are individual decisions rather than one routine that everyone must follow.
Diabetes care also protects health beyond blood sugar. Over time, diabetes can affect the heart and circulation, kidneys, eyes, nerves and feet. Depending on individual needs, follow-up may include blood-pressure and cholesterol management, eye examinations, kidney tests and foot checks. Treatment and regular review can help prevent or delay complications and identify problems early.
Keeping a useful health history
Keeping glucose readings, investigation reports and an up-to-date medicine list together can make follow-up appointments more useful. If you monitor glucose, record the date and time and any relevant details about meals or activity. Bring these records to appointments so your healthcare team can review patterns and discuss changes to your care.
When to seek urgent care
Repeated vomiting, deep or difficult breathing, marked drowsiness or confusion, or fruity-smelling breath need emergency medical assessment, especially alongside thirst and frequent urination. These can be signs of diabetic ketoacidosis, a serious condition that can occur even before diabetes has been diagnosed. Seek emergency care rather than waiting for a routine appointment.
How family members can help
Support begins with asking what would be useful. A family member may welcome help with meal planning, organising reports or attending an appointment, while another may prefer to manage these independently. Listening without judgement and respecting their choices can make support more helpful and easier to accept.