Hyperglycaemia: What It Is, Causes, Symptoms, Treatment & Types

What is Hyperglycaemia?

Hyperglycaemia means that the level of glucose in the blood is higher than normal. It usually occurs when the body does not produce enough insulin or cannot use insulin effectively. Insulin is a hormone that the pancreas makes to move glucose from the blood into the cells for energy.

The normal range for fasting blood sugar is 70 - 99 mg/dL and should be below 140mg/dL 2 hours after a meal. A fasting blood glucose level of 126 mg/dL or above, when confirmed on repeat testing, may indicate diabetes. A post-meal or random blood glucose level above the normal range may also suggest hyperglycaemia. The blood sugar range should be interpreted by a doctor based on symptoms, the timing of the test, and medical history.

Hyperglycaemia is often seen in Type 1 diabetes, Type 2 diabetes, and gestational diabetes. It may also occur due to stress, severe illness, infection, hormonal disorders, or certain medicines such as steroids.

What are the Types of Hyperglycaemia?

Hyperglycaemia is categorised by when it occurs and what causes it. The types include:

How Common is Hyperglycaemia in India?

In India, hyperglycaemia is an escalating public health issue. As per a report published by the International Diabetes Federation, nearly 89.8 million adults are reportedly suffering from diabetes as recorded in 2024, which is projected to cross 150 million in 2050. Additionally, 136 million people were found to be prediabetic in 2021, as per a study by the Indian Council of Medical Research - India Diabetes. This shows that a significant portion of the Indian population is at risk of developing diabetes.

Changing lifestyle, food habits, family history, hypertension, lack of physical activities, and obesity are considered the key risk factors. Since high blood sugar may not cause clear symptoms in the early stages, regular screening is important for people at risk.

What are the Symptoms of Hyperglycaemia?

The signs of hyperglycaemia can develop slowly and can easily go undetected, especially in the early stages. People may remain unaware of having hyperglycaemia until they go for a routine blood sugar check or experience visible symptoms.

Some of the early warning signs and advanced stage symptoms of hyperglycaemia are given in the table below:

Note: Fruity breath, vomiting, stomach pain, rapid breathing, severe dehydration, confusion, fainting, or loss of consciousness may suggest diabetic ketoacidosis or hyperosmolar hyperglycaemic state and need urgent medical care.

Stages of Hyperglycaemia

Hyperglycaemia does not have fixed stages like cancer or Alzheimer's disease. It is better explained in terms of severity levels based on blood glucose readings, symptoms, and the risk of complications.

The table below shows the phase-based progression of hyperglycaemia and its features:

Early detection at Stage 1 or 2 allows for effective outpatient management. Stages 4 and 5 are life-threatening emergencies that require immediate hospital care.

Diseases Similar to Hyperglycaemia

It is easy to mistake hyperglycaemia for other illnesses associated with blood glucose, such as hypoglycaemia (low blood glucose) or diabetes insipidus, since these illnesses can exhibit similar symptoms. This makes it important to understand the differences between these conditions.

The key differences between hyperglycaemia, hypoglycaemia and diabetes insipidus are listed below:

Hyperglycaemia Vs. Hypoglycaemia Vs. Diabetes Insipidus

What Causes Hyperglycaemia?

Many disease-related and lifestyle-related factors can lead to hyperglycaemia or worsen the condition, including:

• Lack of Insulin: The body cannot produce enough insulin, commonly seen in Type 1 and advanced Type 2 diabetes.

• Insulin Resistance: Cells fail to respond adequately to insulin. This is considered the key factor for Type 2 diabetes.

• Physical Inactivity: A sedentary lifestyle can make the cells inefficient at using glucose.

• Illness/Infection: Stress hormones released during illness increase blood sugar.

• Medications: Steroids, diuretics, and some psychotropic medications can increase blood sugar.

• Hormonal Imbalances: PCOS, hypothyroidism, pregnancy, and Cushing's syndrome can impair insulin function and lead to hyperglycaemia.

• Missed Medication: A skipped dose of insulin or an oral hypoglycaemic agent can lead to a blood glucose rise.

• Psychological and Physical Stress: Cortisol and adrenaline hormones produced during emotional and physical stress can cause a spike in blood glucose levels.

• High-Carbohydrate Meals: Large portions of refined carbohydrates, sugary foods, or sweet drinks can cause blood sugar spikes.

What are the Complications of Hyperglycaemia?

Over time, consistently high blood glucose has been found to lead to many damaged organ systems.

Complications associated with hyperglycaemia include:

• Diabetic Ketoacidosis (DKA): DKA is a serious medical emergency caused by insulin deficiency and ketone build-up.

• Hyperosmolar Hyperglycaemic State (HHS): HHS is a life-threatening emergency with very high blood sugar and severe dehydration.

• Nerve Damage: Long-term high blood sugar can cause numbness, tingling, burning pain, or loss of sensation, which often occurs in the feet.

• Kidney Damage: Uncontrolled blood sugar can damage the kidney's filtering system and may lead to chronic kidney disease.

• Eye Disease: Damage to small blood vessels in the retina may cause diabetic retinopathy and vision loss.

• Heart and Blood Vessel Disease: High blood sugar can increase the risk of heart attack, stroke, and peripheral artery disease.

• Foot Problems: Nerve damage and poor blood flow can lead to foot ulcers, infections, and gangrene, which may lead to amputation in some severe cases.

• Slow Wound Healing: Cuts and wounds may take longer to heal, especially in poorly controlled diabetes.

• Recurrent Infections: High blood sugar can increase the risk of skin, urinary, and fungal infections.

When Should I See My Healthcare Provider?

You should see a doctor when you observe:

• Fasting blood glucose over 126 mg/dL or blood glucose after a meal is over 180 mg/dL for some time

• The same symptoms, such as exaggerated thirst, increased urination, or extreme tiredness

• Fruity breath odour, nausea, or vomiting can be a sign of DKA

• Blood glucose readings over 300 mg/dL, which do not lower with medication

• Sudden disorientation, dizziness, or confusion

• Not healing or a long-lasting infection or wound

• Frequent urinary or skin infections for no evident reason

• Losing an unusual amount of weight for no known reason over a short period of time

How is Hyperglycaemia Diagnosed?

Diagnosis of hyperglycaemia is made using three factors, i.e. medical history, physical exam, and blood tests.

Diagnostic Reference Table

Note: These ranges were formulated using internationally accepted diagnostic criteria and should be interpreted by a physician.

How is Hyperglycaemia Managed?

The management of hyperglycaemia includes lifestyle adjustments and medication. The changes are made based on the cause of hyperglycaemia and its severity. Common management strategies for hyperglycaemia include:

• Blood Sugar Monitoring: Monitor blood sugar readings on a regular basis using finger-prick tests after fasting and post-meal, and observe treatment-related changes.

• Dietary Changes: Patients may need to limit sugary drinks, refined carbohydrates, and processed foods. Daily diet charts should be prepared by a doctor or dietitian based on the individual's needs.

• Physical Activity: Regular exercise can improve insulin sensitivity and help the body's cells use glucose more effectively. However, exercise should be avoided during severe hyperglycaemia unless advised by a doctor.

• Weight Management: Healthy weight loss may improve insulin resistance in people with Type 2 diabetes or prediabetes.

• Medicines: Doctors may prescribe oral diabetes medicines or injectable medicines, depending on the cause and severity.

• Insulin Therapy: This can be required in Type 1 diabetes and severe Type 2 diabetes when medications are no longer enough to control blood sugar.

• Emergency Treatment: DKA and HHS require urgent hospital care with IV fluids, insulin, electrolyte correction, and close monitoring.

Common Medicines Used to Treat Hyperglycaemia

Medicines used to treat hyperglycaemia are based on the cause, severity, and nature of diabetes linked with hyperglycaemia. Drugs include oral tablets as well as injections like insulin.

Common medicines used for hyperglycaemia treatment are:

• Metformin: This is commonly used for Type 2 diabetes-related hyperglycaemia. It helps reduce glucose production in the liver and improves the body's response to insulin.

• Glimepiride, Gliclazide, or Glipizide: These sulfonylurea medicines help the pancreas release more insulin. Though widely used in India, these medicines may increase the risk of low blood sugar, especially if the patient skips any meals.

• Sitagliptin, Teneligliptin, Vildagliptin, or Linagliptin: These DPP-4 inhibitors help improve insulin release after meals and control glucose production.

• Dapagliflozin, Empagliflozin, or Canagliflozin: These SGLT2 inhibitors help the body get rid of excess glucose through urine. Dapagliflozin is mainly used for the treatment of Type 2 diabetes.

• Pioglitazone: This medicine improves insulin sensitivity in body tissues. It may be used in selected Type 2 diabetes patients but needs caution in people with fluid retention, heart failure risk, or bone-related risks.

• Liraglutide, Semaglutide, or Dulaglutide: These GLP-1 receptor agonists are injectable medicines used in selected Type 2 diabetes patients, especially when weight control or reducing the risk of heart failure are the main priorities.

• Insulin Lispro, Insulin Aspart, Regular Insulin, Insulin Glargine, Insulin Degludec, or Premixed Insulin: Insulin is essential for Type 1 diabetes and may also be needed in pregnancy, severe hyperglycaemia, DKA/HHS emergencies, or advanced Type 2 diabetes.

• Acarbose or Voglibose: These alpha-glucosidase inhibitors slow carbohydrate digestion and help reduce post-meal blood sugar spikes.

Note: Hyperglycaemia medicines should be taken only under medical supervision. Never start, stop, or change diabetes medicines without consulting a qualified doctor.

Living with Hyperglycaemia: Challenges and Caregiving

Hyperglycaemia is generally a condition that requires daily management. The following are some of the major challenges and aspects of patient care associated with hyperglycaemia:

Hyperglycaemia During Pregnancy

High blood sugar during pregnancy may occur due to gestational diabetes or pre-existing diabetes. Gestational diabetes usually develops in the second or third trimester when pregnancy hormones can make the body less responsive to insulin.

Improper management of high blood sugar during pregnancy may increase the risk of congenital issues. It may also increase delivery complications and pose a higher future risk of Type 2 diabetes in the mother. Doctors may advise regular blood sugar monitoring, meal planning, physical activity, insulin, or other medicines for management of the condition. Regular prenatal follow-up is essential in such cases.

Gestational diabetes often improves after delivery, but follow-up testing is needed because the mother remains at higher risk of Type 2 diabetes later in life.

What is the Prognosis of Hyperglycaemia?

The outcome of hyperglycaemia depends on the identification of the condition and continuous monitoring and control. If blood glucose levels are kept within the advised range, serious complications may be avoided.

However, years of uncontrolled hyperglycaemia can permanently affect the kidneys, eyes, nerves, and heart. Patients with blood glucose controlled to an acceptable level can lead a relatively healthy life. The control is achieved through regular testing, timely administration of medication, and lifelong behavioural changes.

Stress and medication-induced hyperglycaemia may resolve after the cause is resolved or controlled. With Type 2 diabetes, the condition can sometimes go into remission with significant weight loss and diet modification.

How Can I Prevent Hyperglycaemia?

Hyperglycaemia can be prevented or controlled by maintaining healthy blood sugar levels and managing risk factors. Type 1 diabetes cannot be prevented, but strict adherence to treatment advice can help prevent high blood sugar episodes. Type 2 diabetes-related hyperglycaemia may be prevented or delayed in many people through healthy lifestyle habits.

Some measures which can help in controlling and managing blood sugar levels include:

• Maintain a balanced diet with vegetables, whole grains, pulses, lean protein, and fibre-rich foods. Avoid sugary drinks, sweets, refined carbohydrates, and highly processed foods.

• Physical activity can improve insulin sensitivity and help the body's cells use glucose more effectively.

• Maintaining a healthy weight can reduce insulin resistance and lower the risk of Type 2 diabetes.

• Regular blood sugar level monitoring, as advised by a doctor, is important for people with diabetes, prediabetes, PCOS, previous gestational diabetes, obesity, or a family history of diabetes.

• Take diabetes medicines or insulin exactly as prescribed. Do not modify doses without medical advice.

• Regular sleep, yoga, meditation, or breathing exercises can help control blood sugar levels.

• Routine fasting blood sugar, HbA1c, cholesterol, blood pressure, kidney, and eye checks can help detect problems early.

• Avoiding too much smoking and alcohol consumption can reduce the risk of complications.

Hyperglycaemia Treatment Cost in India

Hyperglycaemia treatment expenses in India will vary depending on the severity of the condition, the mode of treatment, the need for testing and monitoring, and the location of the treatment facility. Routine outpatient care is usually less expensive, while diabetic emergencies, such as diabetic ketoacidosis or hyperosmolar hyperglycaemic state, and long-term complications can increase treatment costs significantly.

On average, monthly expenses can range from ₹1,000 to ₹6,000 per month in most cases. However, it can increase to ₹15,000+ if the patient requires insulin, frequent monitoring, newer diabetes medicines, or specialist follow-ups. Hospitalisation costs are not included in the monthly estimates.

Here is a list of the estimated cost range for hyperglycaemic treatment in India:

Note: Costs may vary based on hospital tier, city, and whether generic or branded medicines are prescribed. Consult a doctor for more accurate estimates.

Does Health Insurance Cover Hyperglycaemia?

Health insurance plans in India cover hyperglycaemia-related treatment when it involves hospitalisation, diabetic emergencies such as DKA and HHS, kidney disease, eye disease, stroke, or heart disease. In such cases, critical illness plans can also be beneficial, depending on the coverage and listed complications.

Routine outpatient costs, including medicines, glucometer strips, and regular doctor consultations, may not be covered unless the policy comes with OPD cover or diabetes management benefits.

If diabetes or hyperglycaemia is a pre-existing condition, a waiting period of 1 to 3 years may apply before you can raise a claim. Always review policy details, exclusions, inclusions, waiting periods, and OPD coverage before purchasing a policy or submitting a claim.

How Much Health Insurance Coverage is Needed for Hyperglycaemia Treatment?

The right health insurance coverage will vary with the seriousness of illness, age, type of treatment required, and where you are treated. Generally, a ₹5 to 10 lakh health insurance cover is adequate for routine hospitalisation, diagnostics, medicines, and early complications treatment.

However, those with a history of hyperglycaemia with additional risk factors, such as high blood pressure, high cholesterol, or kidney problems, may benefit from a higher coverage of ₹15 to ₹20 lakh. This can help cover additional costs of critical complications like an ICU admission, dialysis, bypass surgery, or advanced retinopathy treatment.