Type 2 Diabetes: symptoms, diagnosis and management

Type 2 diabetes develops when the body does not use insulin effectively and blood glucose stays too high.

Insulin helps move glucose from the blood into cells for energy. When cells respond less well to insulin, the pancreas may struggle to make enough insulin to keep glucose within the intended range. The condition can develop gradually, and some people have no noticeable symptoms until a blood test identifies it.

Type 2 diabetes can present with thirst, passing urine more often, tiredness, blurred vision, repeated infections, tingling or numbness, and slower healing. Unintentional weight loss can also occur. Symptoms may be mild or develop over time, so their absence does not rule it out.

Seek prompt medical advice for vomiting, confusion, marked drowsiness, severe dehydration, or a rapidly worsening infection. These symptoms need assessment because high glucose can become medically urgent.

Type 2 diabetes has more than one cause. Insulin resistance is central: muscle, liver and fat cells do not respond to insulin as effectively as they should. Over time, insulin-producing cells may not meet the body’s needs. Genetics, body weight, activity, sleep, some medicines and other health conditions can all influence this process.

Glucose levels may rise slowly before diagnosis. With ongoing monitoring and a plan that fits the person, many people can improve glucose management and reduce strain on blood vessels, nerves and organs. Treatment needs can change with illness, weight changes, pregnancy planning, new medicines or life circumstances.

Risk is higher with a family history of type 2 diabetes, previous diabetes in pregnancy, a history of polycystic ovary syndrome, low physical activity, excess body fat around the abdomen, raised blood pressure or abnormal blood fats. These factors guide when a clinician may suggest a blood glucose assessment; they do not diagnose diabetes on their own.

A clinician diagnoses diabetes using blood tests that measure current glucose or average glucose exposure over recent months. They may repeat a test to confirm a result when there are no clear symptoms. The appointment also looks at blood pressure, weight, medicines, foot sensation, kidney health and cardiovascular risk.

Care is individual. Food choices, regular movement, sleep, smoking cessation and weight support can all be part of management. Some people use tablets, injectable medicines or insulin. A prescriber selects treatment according to glucose levels, kidney function, other conditions, side effects and personal priorities. Do not stop a prescribed diabetes medicine without discussing it with the prescribing clinician.

A practical routine can include taking medicines as prescribed, keeping appointments, checking feet for cuts or colour changes, and making a sick-day plan with the care team. Bring a medicine list and any glucose readings to reviews. Nutrition support can focus on sustainable meals rather than restrictive rules.

Persistently raised glucose can damage small blood vessels and nerves and can contribute to kidney disease, eye problems, foot ulcers and cardiovascular disease. Loss of sensation can make foot injuries easier to miss. New redness, warmth, swelling, discharge or broken skin on a foot warrants timely clinical attention.

For people at risk, regular activity, nourishing eating patterns, weight support where appropriate and screening can help identify glucose changes early. For people already diagnosed, the same habits work alongside medical treatment rather than replacing it.

A GP or primary-care clinician can arrange testing, begin management and coordinate reviews. Diabetes educators, dietitians, pharmacists, podiatrists and specialist teams may be involved when goals are difficult to reach or complications need focused care.