Type 2 Diabetes: Symptoms, Diagnosis and Treatment

Thirst that won't go away, afternoon fatigue, and wounds that take longer to heal than they used to — it's easy to blame stress and aging. Yet type 2 diabetes can develop silently for years, and many people discover it by chance from a routine blood test. Let's break down the mechanism, the warning signs, and what lab results look like in diabetes.

What Is Type 2 Diabetes: Insulin Resistance and How It Differs from Type 1

Type 2 diabetes is a disorder of glucose metabolism driven by insulin resistance. Think of insulin as a key and cell receptors as locks. In type 2 diabetes the locks have "rusted": insulin is present — often in excess — but cells stop responding to it. Glucose can't get in and accumulates in the blood.

In type 1 diabetes the immune system destroys insulin-producing cells and there is no insulin at all. Type 2 is a lifestyle and genetic condition — and it can often be controlled without insulin.

Risk Factors: Who Is at Risk

Risk is significantly higher with: excess body weight and obesity — especially abdominal fat; age over 45; family history of diabetes; gestational diabetes; physical inactivity and poor diet; polycystic ovary syndrome; high blood pressure and lipid profile abnormalities.

Symptoms of Type 2 Diabetes

Type 2 diabetes may be asymptomatic for 5–10 years. When symptoms appear: frequent heavy urination and constant thirst (kidneys flush excess glucose with water); chronic fatigue; slow wound healing; recurrent infections; vision changes; numbness and tingling in the feet — an early sign of neuropathy.

Diagnosis: Normal Blood Sugar Levels and Tests That Confirm Diabetes

Fasting Blood Glucose

Result	Interpretation
< 6.1 mmol/L	Normal
6.1–6.9 mmol/L	Impaired fasting glucose (prediabetes)
≥ 7.0 mmol/L	Diabetes (confirmed on two occasions)

Glycated Hemoglobin (HbA1c)

HbA1c reflects average glucose over the past 2–3 months and is independent of recent meals — making it the key marker for both diagnosis and treatment monitoring.

HbA1c	Interpretation
< 5.7%	Normal
5.7–6.4%	Prediabetes
≥ 6.5%	Diabetes
< 7.0%	Treatment target

Oral Glucose Tolerance Test (OGTT)

Blood glucose measured 2 hours after drinking 75 g of glucose. Detects impaired glucose tolerance — a form of prediabetes that fasting glucose alone can miss.

Additional Tests Important in Type 2 Diabetes

Lipid panel — type 2 diabetes almost always raises triglycerides and lowers HDL, sharply increasing cardiovascular risk.

Kidney function test with creatinine — diabetic nephropathy develops in 30–40% of patients. Early stages are detected by microalbuminuria and GFR.

Treatment of Type 2 Diabetes

The goal is to keep HbA1c below 7%. Losing 5–10% of body weight reduces HbA1c by 1–2% — comparable to medication. More on non-drug ways to lower blood sugar in a dedicated article. Metformin is the first-line drug. Insulin in type 2 diabetes is started when the pancreas exhausts its reserves over the long course of disease.

Complications If Diabetes Is Untreated

Chronically high glucose damages blood vessels, leading to: diabetic retinopathy (a leading cause of blindness); diabetic nephropathy; neuropathy and diabetic foot syndrome; atherosclerosis — heart attack and stroke risk is 2–4 times higher.

When to See a Doctor Urgently

Immediately if: glucose above 16–17 mmol/L with nausea and vomiting — possible ketoacidosis; sudden hypoglycemia (trembling, cold sweat, confusion); non-healing foot ulcers for more than 2 weeks; newly found glucose ≥ 7.0 mmol/L — schedule a consultation.

Summary

Type 2 diabetes is a manageable chronic condition. The earlier it is caught, the greater the chance of controlling it through lifestyle change. Key tests: fasting glucose and HbA1c. If you are at risk and haven't checked your blood sugar in the past 2 years — now is the time.

This article is for informational purposes only. Interpretation of test results and treatment decisions are the responsibility of a physician.