Does Pain Raise Blood Sugar? Causes and Tips

Does pain raise blood sugar? Yes, and this is a clinically recognised phenomenon that can catch people with diabetes off guard. When the body experiences pain, it triggers a stress response involving adrenaline and cortisol, both of which cause glucose to be released into the bloodstream. This can lead to measurable rises in blood sugar, even without any change in diet or medication. Understanding why this happens, which types of pain are most likely to have an effect, and how to manage glucose levels during painful episodes can help people with diabetes respond confidently and safely.

Can pain actually raise your blood sugar levels?

Yes, pain raises blood sugar by triggering a stress response that releases glucose into the bloodstream, an effect known as stress hyperglycaemia, which is particularly significant for people with diabetes whose compensatory insulin response is impaired.

Yes, pain can raise blood sugar levels, and this effect is well recognised in clinical practice, particularly among people living with diabetes. When the body experiences pain, it triggers a physiological stress response that causes glucose to be released into the bloodstream. This is sometimes called stress hyperglycaemia. It can lead to measurable rises in blood glucose, even in people who have not eaten recently and who are otherwise managing their condition well.

The relationship between pain and blood sugar is not always straightforward. The degree of elevation depends on several factors, including the intensity of the pain, how long it lasts, and the individual's underlying health. For people without diabetes, the body typically compensates by releasing additional insulin to bring glucose back to normal. For those with type 1 or type 2 diabetes, this compensatory mechanism may be impaired, meaning blood sugar can remain elevated for longer.

It is important to understand that this is a physiological response, not a sign that diabetes is worsening or that medication has stopped working. Recognising pain as a potential trigger for blood sugar fluctuations can help people with diabetes interpret unexpected readings more accurately and respond appropriately, rather than making unnecessary changes to their treatment without medical guidance. If readings remain persistently outside your agreed target range, this should prompt a conversation with your GP or diabetes team, as described in the final section of this article.

Why does the body release glucose when you are in pain?

Pain activates the sympathetic nervous system and HPA axis, prompting adrenaline and cortisol release; these hormones stimulate liver glucose production and reduce insulin sensitivity, causing blood sugar to rise.

The body releases glucose during pain as part of the stress response, driven primarily by the hormones adrenaline (epinephrine) and cortisol. When pain signals reach the brain, the hypothalamus activates the sympathetic nervous system and the hypothalamic-pituitary-adrenal (HPA) axis, prompting the adrenal glands to secrete these hormones rapidly.^[6][2] Both adrenaline and cortisol act on the liver to stimulate glycogenolysis, the breakdown of stored glycogen into glucose, and gluconeogenesis, the production of new glucose from non-carbohydrate sources.^[2][3]

This mechanism evolved as a survival response. In situations of acute threat or injury, the body anticipates a need for rapid energy, whether to fight or flee. Releasing glucose into the bloodstream ensures that muscles and the brain have immediate fuel available. In this context, the rise in blood sugar is purposeful rather than harmful.

However, in modern clinical settings, particularly for people managing a chronic condition such as diabetes, this same response can create difficulties. Cortisol also reduces the sensitivity of cells to insulin, meaning that even if insulin is present, it is less effective at moving glucose out of the bloodstream.^[2][7] This dual effect, more glucose being produced and less being cleared, explains why pain can cause significant and sometimes prolonged hyperglycaemia. The magnitude and duration of this effect can vary depending on the individual, any comorbidities, and whether effective analgesia is used. Understanding this mechanism helps both patients and clinicians interpret blood glucose readings in the context of a painful episode rather than in isolation.

Which types of pain are most likely to affect blood sugar?

Severe acute pain, chronic pain, neuropathic pain, post-operative pain, and dental infections are most likely to raise blood sugar, with infection carrying an additional independent effect on insulin resistance.

Severe or prolonged pain is most likely to cause a clinically significant rise in blood sugar, though even moderate pain can have a measurable effect in people with diabetes. Individual responses vary, and the presence of infection alongside pain carries its own independent effect on insulin resistance. The following types of pain are particularly associated with blood glucose fluctuations:

• Acute severe pain, such as that from a fracture, surgical procedure, kidney stone, or acute injury, tends to produce the most pronounced stress hormone response and therefore the sharpest rises in blood glucose.

• Chronic pain conditions, including neuropathic pain, inflammatory arthritis, and lower back pain, can cause sustained elevation of cortisol over time, contributing to persistently higher baseline blood sugar levels.

• Neuropathic pain, which is itself a complication of poorly controlled diabetes, creates a particularly complex situation: the pain raises blood sugar, which in turn can worsen nerve damage and intensify the pain.^[8][9]

• Post-operative pain is a well-documented cause of perioperative hyperglycaemia. NHS surgical teams and the Joint British Diabetes Societies (JBDS) perioperative guidelines recommend routine blood glucose monitoring in patients with diabetes during and after procedures.^[10]

• Dental pain and infections can also trigger a stress response sufficient to affect glucose levels. Infections in particular carry their own independent effect on insulin resistance, and Diabetes UK advises that illness and infection are common causes of raised blood sugar.^[1][18]

It is worth noting that emotional or psychological pain, including acute anxiety and grief, activates the same stress hormone pathways and can similarly raise blood sugar. This underlines the importance of holistic diabetes management that considers mental as well as physical wellbeing.

How can people with diabetes manage blood sugar during painful episodes?

Increased glucose monitoring, treating the underlying cause of pain, maintaining medication schedules, and following sick-day rules are the key steps; significant medication changes should always be guided by a GP or diabetes team.

People with diabetes can take several practical steps to manage blood sugar during painful episodes, though any significant changes to medication should always be discussed with a GP or diabetes team first. The most important starting point is increased monitoring. Checking blood glucose more frequently during a painful episode, whether using a finger-prick glucometer or a continuous glucose monitor (CGM), provides the information needed to respond appropriately.

Beyond monitoring, the following strategies are commonly recommended:

• Address the underlying cause of pain where possible. Treating an infection, managing a flare of arthritis, or using appropriate analgesia can reduce the stress hormone response and help stabilise blood sugar.

• Stay hydrated, as hyperglycaemia increases the risk of dehydration, which can in turn worsen glucose control.

• Maintain regular meals and medication schedules as far as possible, even if appetite is reduced. Skipping meals while blood sugar is already elevated can complicate management.

• Avoid high-sugar comfort foods, which are sometimes sought during painful or distressing periods and can compound the glucose rise.

• Discuss analgesia options with a pharmacist or GP, as some medicines can affect blood sugar. Systemic corticosteroids (such as prednisolone tablets) are a well-recognised cause of raised blood glucose.^[7] Higher-dose inhaled or rectal corticosteroid preparations may also have an effect. Most low-dose topical steroids applied to small areas of skin have minimal glycaemic impact, but if you are unsure about any medicine, ask your pharmacist or GP before taking it. Decongestants containing sympathomimetics (such as pseudoephedrine) may also contribute to raised blood sugar in some people.^[14][15]

Sick-day rules for people with type 1 diabetes: If you have type 1 diabetes and are unwell or in significant pain, it is essential to continue your basal (background) insulin even if you are not eating. Never stop basal insulin without specialist advice. Check your blood or urine ketones when you are unwell or when blood glucose is persistently elevated. If ketones are raised, or if you develop symptoms of diabetic ketoacidosis (DKA), seek urgent medical advice as described in the next section. Diabetes UK and NHS sick-day guidance provide detailed advice on managing insulin and ketone monitoring during illness.

For people using insulin, temporary dose adjustments may be needed during periods of significant pain, but these should be guided by a diabetes specialist or the structured sick-day rules provided by your diabetes team. Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online consultations with prescriber review and pharmacist support, which may be a useful resource for people seeking guidance on managing their condition alongside other health concerns.

When should you speak to your GP or diabetes team about pain and glucose?

Contact your GP or diabetes team if blood glucose remains significantly elevated for more than a day or two, or immediately if you develop symptoms of DKA or HHS, both of which are medical emergencies.

You should speak to your GP or diabetes team promptly if pain is causing blood sugar readings that are consistently outside your agreed target range, or if you are unsure how to adjust your management safely. Persistent hyperglycaemia, even when explained by pain, carries risks including increased susceptibility to infection, slower wound healing, and, over time, progression of diabetes-related complications.^[13][16]

Contact your GP or diabetes team if you notice any of the following:

• Blood glucose readings that remain significantly elevated for more than a day or two despite your usual management.

• Pain that is new, unexplained, or worsening, particularly if accompanied by fever, as this may indicate an infection requiring treatment in its own right.

• Symptoms of diabetic ketoacidosis (DKA) in people with type 1 diabetes, including nausea, vomiting, abdominal pain, and fruity-smelling breath. DKA is a medical emergency and requires immediate assessment at an A&E department.

• For people with type 2 diabetes, symptoms that may suggest hyperosmolar hyperglycaemic state (HHS), including marked thirst, passing large amounts of urine, severe dehydration, confusion, or drowsiness. HHS is also a medical emergency: call 999 or go directly to A&E.

• Recurrent episodes of pain-related hyperglycaemia that suggest your current treatment plan may need review.

For urgent advice that does not require an emergency response, NHS 111 is available around the clock. If you are experiencing symptoms consistent with DKA, HHS, or another acute emergency, call 999 or go directly to A&E.

It is also worth raising chronic pain with your diabetes team even when blood sugar appears stable, as uncontrolled pain can affect sleep, physical activity, and mental health, all of which influence long-term glucose management. If you suspect a medicine is causing unexpected side effects, these can be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

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