Know the Symptoms Of High Blood Sugar In Non-Diabetics!

t is common to have some fluctuations in your blood glucose levels based on food intake and other health conditions. However, is fluctuation above the normal range in a non-diabetic safe? At what range are blood sugar level fluctuations considered unsafe? Read on to know more about it

Many people who do not have diabetes think that they can get away with eating more sweets and carbohydrate-rich food. However, did you know that high blood sugar (glucose) can affect anyone, diabetic or not? Hyperglycaemia can cause several complications if left untreated. In this article, we discuss the symptoms of high blood sugar in non-diabetics, the underlying causes which may lead to hyperglycaemia in healthy individuals, and why you should watch your blood sugar levels despite not having diabetes.


What is Non-Diabetic Hyperglycaemia?

Non-diabetic hyperglycaemia is a condition in which there is too much sugar (glucose) in your blood, despite you not having diabetes. Hyperglycaemia is a primary clinical sign of diabetes mellitus. However, it can impact you even if you have not been diagnosed with Type 1 Diabetes or Type 2 Diabetes.

The normal recommended fasting blood glucose range in healthy individuals is 70 to 99 mg/dL (non-diabetic sugar levels). You are considered prediabetic if you have a fasting glucose level between 100 to 125 mg/dL.

Hyperglycaemia is diagnosed when your blood sugar levels are above 180 mg/dL, two hours after eating. If your blood sugar is above 180 mg/dL without the underlying cause of Type 1 or Type 2 Diabetes, then your condition is termed non-diabetic hyperglycaemia. You may begin experiencing the symptoms of high blood sugar levels once they reach 160 mg/dL. 

Non-diabetic hyperglycaemia can be caused by chronic health conditions, medications, stress, injury, lack of exercise, etc. The condition can be resolved by treating the underlying cause.

What are the Symptoms of High Blood Sugar in Non-Diabetics?

The symptoms of nondiabetic hyperglycaemia are similar to those in diabetic hyperglycaemia. They include:

  • Increased thirst
  • Frequent urination
  • Nausea and vomiting
  • Abdominal pain
  • Fatigue
  • Headache
  • Blurred vision

What Causes Blood Sugar to Rise in Non-Diabetics?

The following are some of the conditions and factors that can cause high blood sugar levels in non-diabetic individuals:

Cushing’s Syndrome

Cushing’s syndrome occurs when your body produces excessive amounts of the stress hormone cortisol from the adrenal gland for a long period of time. This condition may also occur due to the prolonged use of oral corticosteroid medications.

Due to the increased level of the hormone cortisol in your body, you are at an increased risk of developing hyperglycaemia if you are diagnosed with Cushing’s syndrome. Cortisol counteracts the effects of insulin, which prevents the uptake of glucose into your cells from your bloodstream. It also decreases the release of insulin from the pancreas, resulting in high blood glucose levels.

Pancreatic Diseases

Pancreatic disorders such as pancreatitis, pancreatic cancer, and cystic fibrosis can lead to high blood glucose levels. Insulin is produced and released from the beta cells of your pancreas. 

In a diseased condition, the damaged pancreatic cells are no longer able to produce sufficient insulin to facilitate the transport of glucose from the bloodstream to the cells in your muscles and liver. This results in non-diabetic hyperglycaemia in individuals with pancreatic disorders.

Polycystic Ovarian Syndrome

Polycystic ovary syndrome (PCOS) is a hormonal disorder common in women of reproductive age (15 to 49 years), that causes irregular, prolonged, or heavy menstrual periods. Women with PCOS have high levels of insulin in their bodies, and they may also exhibit insulin resistance

If you have insulin resistance, the insulin receptors in your cells cannot bind to the insulin in your bloodstream. This results in a failure to mobilise glucose from your blood into muscle and liver cells, leading to hyperglycaemia.


Stress can cause high blood sugar levels in a non-diabetic. Physical or mental stress in the form of trauma, surgery, injury, infections, or burns can increase blood glucose levels. During stress, your body releases stress hormones like cortisol and adrenaline, which set off a “fight or flight” response in your body. Cortisol triggers the release of glucose from your liver for instant production of energy during times of stress.

According to researchers, high levels of cortisol might interfere with the functioning of beta cells in the pancreas and reduce the amount of insulin they produce, further contributing to high glucose levels.

Medication Side Effects

Sometimes, medications can also induce hyperglycaemia in your body. If you take medications like antidepressants, antibiotics, corticosteroids, etc., there is a high chance of you experiencing high blood glucose levels. 

These medications induce hyperglycaemia by altering insulin secretion in the pancreas, reducing insulin sensitivity in your muscle and liver cells, or by increasing glucose production. It is important to discuss the long-term side effects of the medications with your doctor in order to prevent such complications.


If you are obese and have a body mass index (BMI) above 30kg/m2, you may be at risk for developing hyperglycaemia. Fat cells in the body release inflammatory proteins such as interleukins and tumour necrosis factors, which interfere with the body’s ability to produce and release insulin. This can lead to poor control of blood glucose levels.

Excess fat cells and tissue in your body, especially around the abdomen, can also lead to increased insulin resistance in your body, which can cause hyperglycaemia.


If you have a family history of Type 2 or gestational diabetes, you may inherit a genetic predisposition to these diseases, the onset of which can be triggered by lifestyle and environmental factors.

Even if you do not develop Type 2 Diabetes, you may be at risk for prediabetes and high blood sugar levels associated with it if you have immediate family members (parents, siblings, grandparents) who have diabetes mellitus.

Lack of Physical Activity

A lack of physical activity and a sedentary lifestyle can lead to an increase in your blood glucose levels. Your skeletal muscle uses the glycogen (the stored form of glucose) in the muscle cells to produce energy during physical activity. 

In the absence of physical movement, the glycogen remains stored and the excess glucose remains in the bloodstream, causing elevated blood glucose levels.

What are the Complications of High Blood Sugar in Non-Diabetics?

Unlike diabetes, the symptoms of non-diabetic hyperglycaemia often go unnoticed. If the condition is not diagnosed early and treated, you may develop complications such as:

  • Slow healing of wounds.
  • Damage to the arteries and blood vessels, increasing your risk of heart attack and stroke.
  • Neuropathy (nerve damage leading to pain, tingling, loss of sensation, etc.).
  • Suppressed immunity, leading to recurring infections.


What are the Best Treatments of High Blood Sugar in Non-Diabetics?

Often, the treatment for non-diabetic hyperglycemia includes resolving the underlying condition that is causing high blood sugar levels. Your doctor may also ask you to make healthy lifestyle changes like eating a balanced diet, exercising regularly, quitting smoking, limiting alcohol consumption, managing stress in a healthy way, etc. to better control your blood sugar levels.

How can you Prevent High Blood Sugar in Non-Diabetics?

Exercise regularly

Regular physical activity can help you lower your blood glucose levels. During exercise, your body uses the glycogen stored in your muscles to generate energy. In order to compensate for the shortage of glycogen, the muscle cells take up glucose from your bloodstream. The increased utilisation of glucose increases the insulin sensitivity of the cells and decreases blood glucose levels.

Regularly exercising for at least 30 mins a day for at least 5 days a week has a positive impact on your blood glucose levels.

Maintain a healthy weight

Obesity increases insulin resistance in your body, thus putting you at risk of high blood glucose levels. Consult your healthcare provider to create a healthy weight loss plan if you are overweight.

Eat a balanced diet

Improve your diet by incorporating more fruits and vegetables containing high fibre. Reduce your consumption of carbohydrates and unhealthy fats. A balanced diet is crucial to keep your blood glucose levels stable.

Quit smoking

The nicotine in cigarettes not only causes lung cancer but also increases your blood glucose levels. It damages the cells in your body and causes insulin resistance.

Limit or avoid alcohol

Most types of alcohol contain a high amount of carbohydrates, which can cause a spike in your blood glucose levels when consumed. It is advisable to limit your alcohol consumption as much as possible.

Don’t Have Time To Read?

  • Non-diabetic hyperglycaemia refers to elevated blood glucose (sugar) levels which are not in the diabetic range, and are not caused by diabetes.
  • A fasting blood glucose level over 100 mg/dL that is not caused by diabetes can indicate non-diabetic hyperglycaemia.
  • The symptoms of non-diabetic hyperglycaemia are similar to the symptoms of diabetes. You may experience increased thirst, frequent urination, nausea, vomiting, abdominal pain, fatigue, headache, and blurred vision.
  • Some of the causes of non-diabetic hyperglycaemia include Cushing’s syndrome, pancreatic disease, PCOS, trauma, medication side effects, obesity, genetics, and a lack of physical activity.
  • The complications of non-diabetic hyperglycaemia are slow wound healing, suppressed immunity, and damage to your nerves, blood vessels, and arteries.
  • Treatment for non-diabetic hyperglycaemia includes resolving the underlying cause or condition responsible for the high blood sugar levels along with healthy lifestyle changes like eating a balanced diet, exercising regularly, quitting smoking, limiting alcohol consumption, managing stress in a healthy way, etc.
  • Use the Phable Care App to consult India’s leading diabetologists, order medicines, book lab tests, integrate blood sugar monitoring and other devices to get real-time remote care from the comfort of your home. Also, check out our Diabetes Management program which provides ‎360º care. Let’s treat diabetes together.

Friendly Asked Questions

Do steroids raise blood sugar in non-diabetics?

Steroidal medications are prescribed to decrease any inflammation in the body. They can also increase your blood sugar levels. Steroids can trigger your liver breakdown proteins to release more glucose, increase insulin resistance in your cells and interfere with the uptake of glucose in your muscle and fat cells. This can lead to non-diabetic hyperglycaemia in people who are taking steroid medications.

Can your blood sugar be high without having diabetes?

Yes, your blood sugar can be high without you having Type 1 or Type 2 Diabetes. Medication, stress, trauma, injuries, surgery, infections, and some health conditions like inflammation of the pancreas, PCOS, and Cushing’s syndrome can increase blood sugar levels.

How do you feel when your blood sugar is too high?

Elevated blood sugar levels can cause symptoms like excessive thirst, frequent urination, blurred vision, excessive hunger, fatigue, headache, and blurred vision. Likewise, symptoms of high blood sugar in non-diabetics will be the same.

What happens when a non-diabetic person’s blood sugar gets too high?

In most cases, the symptoms of high blood sugar in a non-diabetic go unnoticed. In the short term, high blood sugar levels can cause issues like headaches, fatigue, blurred vision, etc. Over time, hyperglycaemia may eventually lead to complications like suppressed immunity, recurring infections, slow-healing wounds, damage to blood vessels, nerves, etc.