What Questions to Ask a Diabetic Patient?

Asking the right questions during a diabetes consultation goes far beyond blood sugar numbers. A thorough assessment covers medication use, daily habits, emotional well-being, financial barriers, and screening for complications that patients may not recognize on their own. The range of topics might surprise even experienced clinicians, because diabetes touches nearly every organ system and interacts with almost every aspect of daily life. What follows is a practical walkthrough of the areas worth probing, organized roughly from the most routine to the most commonly overlooked.

Glycemic Control and How the Patient Understands It

The obvious starting point is asking about blood sugar levels and the most recent HbA1c result. But the more revealing question is whether the patient actually understands what those numbers mean. A qualitative study of 25 adults with diabetes found that while most participants were familiar with HbA1c, their understanding of what the value represented varied widely. Patients used a mix of cues to judge their own control: how well they followed self-care routines, how many medications they took, whether they had symptoms they attributed to diabetes, and what their home glucose readings showed.¹ This means a patient who says “my diabetes is under control” could be basing that assessment on something very different from what the lab results show. Asking patients to explain in their own words what their last HbA1c means, or what blood sugar range they’re aiming for, quickly reveals gaps that can be addressed before they lead to trouble.

Medication Adherence and Missed Doses

Asking “Are you taking your medications?” almost always gets a yes. A more productive approach is to ask how often doses get missed, and why. In a validation study of a diabetes medication adherence questionnaire, about 30 percent of patients admitted to forgetting doses when the question was framed specifically. Among those who forgot, most said it happened roughly once a month, while a smaller number reported forgetting every couple of weeks.² The frequency matters because occasional missed doses and habitual ones have very different effects on glucose control. Follow-up questions that help clarify the picture include whether the patient understands what each medication does, whether side effects are discouraging them from taking it, and whether they’ve made any changes to their regimen on their own without telling their provider.

Injection Technique and Site Rotation

For patients on insulin, the conversation shouldn’t stop at dosing. How and where they inject has a direct effect on how well the insulin works. Lipohypertrophy, which refers to lumpy fatty tissue that builds up at overused injection sites, is a common problem that patients rarely bring up on their own. A study of 430 insulin-injecting outpatients used a detailed questionnaire about injection habits paired with a nurse examination of injection sites to identify lipohypertrophy.³ Separately, research investigating errors in injection technique found connections between improper pen use, failure to rotate sites, incorrect insulin storage, and a higher frequency of low blood sugar episodes.⁴

Practical questions worth asking include: Do you rotate your injection sites? Have you noticed any bumps or hard spots where you inject? Do you reuse needles? How do you store your insulin at home? Injecting into lipohypertrophic tissue can cause erratic absorption, leading to unexplained blood sugar swings. This is one of those issues that won’t surface unless someone asks directly.

Eating Habits and Meal Timing

Dietary management remains a cornerstone of diabetes care, but asking a patient “Are you watching your diet?” is about as useful as asking whether they’re being careful with money. The question is too vague to produce actionable information. A more structured approach involves asking about typical eating patterns: what a normal day of meals looks like, how consistent carbohydrate intake is from meal to meal, how often meals are skipped, and whether portion sizes have changed. Clinicians should evaluate carbohydrate consistency and portion control to help patients reach their glycemic targets.⁵ Questions about who prepares meals, whether the patient eats out frequently, and whether they have access to fresh food can also reveal practical obstacles that no amount of nutritional counseling will fix on its own.

Physical Activity and Safety Before Starting

Exercise is one of the most effective tools for improving insulin sensitivity, but for a patient with diabetes, jumping into a new routine without screening carries real risks. The American Diabetes Association recommends that before prescribing a new exercise regimen, providers should assess patients for conditions that could make certain types of activity dangerous. That includes checking for eye disease, kidney problems, nerve damage, and cardiovascular risk.⁶ Previously inactive patients with multiple cardiovascular risk factors should ideally get a baseline cardiovascular evaluation before ramping up intensity.

Beyond safety screening, the practical questions are just as important. Does the patient know how to adjust insulin or food intake around exercise to avoid low blood sugar? Strategies to prevent hypoglycemia during and after activity need to be tailored to the individual, because the glucose response differs depending on the type of exercise, its duration, and the timing relative to meals and medication. Simply asking “Do you exercise?” misses all of this. Better to ask what kind of activity they do, how often, and what happens to their blood sugar when they’re active.

Foot Health

Foot problems in diabetes can escalate from minor to limb-threatening faster than most patients expect. A systematic review of global foot screening guidelines identified three core components that every assessment should cover: checking for nerve damage, evaluating blood flow, and visually inspecting the feet.⁷ But the clinical examination only catches problems at the visit. Between visits, the patient is the early warning system. Key questions include: Have you noticed any numbness, tingling, or burning in your feet? Do you check your feet daily? Have you had any sores or blisters that were slow to heal? Do your shoes fit well? Patients with neuropathy may not feel injuries at all, so asking “Do your feet hurt?” can be misleading. Better to ask specifically about sensation changes and to inquire whether anyone at home helps them inspect areas they can’t easily see.

Eye Exams and Screening Adherence

Diabetic eye disease develops silently. By the time a patient notices vision changes, damage may be advanced. This makes annual dilated eye exams critical, yet adherence is notoriously poor. Research into what predicts whether patients follow through with eye exams found that practical barriers matter as much as medical ones. Patients who believed insurance covered most of the exam cost, who viewed eye exams as a top priority, and who understood that diabetic eye disease could be detected during an exam were more likely to follow through. Lower HbA1c, having insurance, and a longer duration of diabetes also predicted adherence.⁸ Asking “When was your last dilated eye exam?” is the starting point, but asking whether the patient knows why the exam matters and whether cost or transportation is a barrier can help close the gap.

Cardiovascular Symptoms

Heart disease is the leading cause of death in people with diabetes, and its presentation can be atypical. A study comparing cardiac symptoms in patients with and without diabetes found that chest pain or discomfort was the most common symptom among diabetic patients, while a sense of irregular heartbeat was more common in those without diabetes.⁹ Worth remembering: some patients with diabetes experience “silent” cardiac events with minimal or no chest pain, so asking about exertional shortness of breath, unusual fatigue during physical activity, or swelling in the legs can catch what a standard chest-pain question misses. Reviewing current blood pressure readings, cholesterol management, and whether the patient smokes rounds out the cardiovascular picture.

Emotional Well-Being and Diabetes Distress

Living with a chronic condition that demands constant self-management takes a psychological toll that often goes unaddressed. Diabetes distress is distinct from clinical depression: it’s the frustration, worry, and burnout that come specifically from managing diabetes day after day. Validated tools like the Problem Areas in Diabetes (PAID) scale can quantify distress into low, moderate, and high categories. Research using latent class analysis found that a PAID score of 40 or above reliably identifies high distress, while scores between 17 and 39 indicate moderate distress worth monitoring.¹⁰

You don’t need to administer a formal scale every visit, but asking open-ended questions helps: How are you feeling about managing your diabetes? Is anything about it overwhelming right now? Do you ever feel like giving up on parts of your care? Patients experiencing moderate distress may benefit from targeted support before they tip into burnout that compromises their self-care entirely.

Financial Barriers and Food Security

Cost is one of the most powerful and least discussed drivers of poor diabetes outcomes. Research using National Health Interview Survey data found that financial stress, financial insecurity with healthcare costs, and food insecurity were each independently associated with a greater likelihood of cost-related medication non-adherence, even after adjusting for income and insurance status.¹¹ A separate study found that food insecurity roughly doubled the odds of poor diabetes control, and that patients who skipped medications because of cost had nearly twice the odds of poor control as well as higher rates of emergency department use.¹²

These aren’t comfortable questions to ask, but they’re necessary ones. Have you ever skipped or rationed your medication because of cost? Do you have enough food at home to follow the eating plan we discussed? Are you having trouble affording test strips or other supplies? Patients rarely volunteer this information. Normalizing the question by framing it as something you ask everyone can help. When these barriers are identified, connecting patients with assistance programs, switching to lower-cost medication alternatives, or adjusting the treatment plan to what is actually feasible can produce better results than optimizing a regimen the patient can’t afford to follow.

Sick-Day Management

Patients with diabetes need a clear plan for what to do when they get sick with a cold, flu, stomach bug, or any illness that disrupts normal eating and medication routines. Illness raises stress hormones, which can spike blood sugar even when the patient isn’t eating. For people on insulin, the risk of diabetic ketoacidosis rises during illness. Research using simulation-based sick-day education for patients with type 1 diabetes found that it could both assess knowledge of sick-day protocols and determine whether patients had the necessary supplies at home.¹³ A related study highlighted a mismatch between how confident patients and caregivers felt about managing ketosis at home and their actual ability to perform the steps correctly when tested.¹⁴

Questions to ask include: Do you know what to do with your diabetes medications when you’re sick? Do you have ketone testing strips at home, and do you know when to use them? At what point would you call us or go to the emergency room? Many patients have never been given explicit sick-day rules, and even those who have may not remember them when they’re actually unwell.

Sleep and Obstructive Sleep Apnea

Sleep problems and type 2 diabetes overlap far more than most patients realize. Obstructive sleep apnea, which causes repeated breathing interruptions during sleep, is common in people with type 2 diabetes and worsens insulin resistance. A screening study of 307 patients with type 2 diabetes found that about 31 percent were identified as being at high risk for moderate-to-severe sleep apnea.¹⁵ Asking whether the patient snores loudly, wakes up gasping, or feels excessively tired during the day despite adequate sleep time can flag patients who should be referred for a sleep study. Treating sleep apnea with CPAP therapy can improve blood pressure and may modestly improve glucose control, so this is one of those screening questions with a concrete payoff.

Reproductive Health and Preconception Counseling

For women of childbearing age with diabetes, questions about family planning deserve a dedicated place in the conversation. Uncontrolled blood sugar in the early weeks of pregnancy, often before a woman even knows she’s pregnant, significantly raises the risk of birth defects and pregnancy complications. Yet a scoping review found that women with diabetes consistently received less contraception counseling and lower rates of preconception planning compared to women without diabetes.¹⁶ The same review noted lower rates of routine preventive screening like mammograms and cervical cancer screening in this population. Asking “Are you planning or could you become pregnant in the next year?” opens the door to optimizing glucose control before conception and reviewing medications that may need to be changed during pregnancy.

Alcohol, Tobacco, and Substance Use

Alcohol use is frequently underassessed in diabetes care, even though it directly affects blood sugar, medication adherence, and long-term outcomes. A review of the evidence found that alcohol consumption by diabetes patients is often inadequately assessed and addressed during medical visits, despite the fact that at-risk drinking is associated with poor treatment adherence, increased illness, and higher mortality.¹⁷ Alcohol can cause delayed hypoglycemia, particularly overnight after evening drinking, which is dangerous for patients on insulin or sulfonylureas. A simple, non-judgmental question about how many drinks the patient has in a typical week, and whether they’ve noticed any blood sugar effects afterward, can identify a problem that quietly undermines otherwise good diabetes care. Tobacco use and recreational drug use should also be asked about, since smoking accelerates vascular damage and cannabis can affect appetite and eating patterns.

Herbal Supplements and Alternative Therapies

A significant number of people with diabetes use herbal remedies or dietary supplements alongside their prescribed medications, and many never mention it to their doctor. A study of Thai patients with type 2 diabetes noted a high level of interest in herbal and dietary supplement use and concluded that healthcare professionals should proactively incorporate this topic into clinical practice.¹⁸ The risk isn’t theoretical: a systematic review examining the safety of herbal medicine in type 2 diabetes identified 49 commonly used herbs, of which 7 were classified as contraindicated, 19 required caution, and 12 had documented potential interactions with conventional diabetes drugs.¹⁹ Some of these herbs can potentiate glucose-lowering medications, increasing the risk of hypoglycemia. Others may interfere with the absorption or metabolism of prescribed drugs. Asking “Are you taking any supplements, vitamins, or herbal remedies?” in a way that normalizes the question rather than implying disapproval tends to get more honest answers.

Vaccination Status

People with diabetes face a higher risk of complications from common infections, making vaccination particularly important. Despite this, uptake for several recommended adult vaccines remains low. A cross-sectional study of adults with diabetes found that while COVID-19 vaccination rates were relatively high, uptake for pneumococcal, influenza, tetanus, and shingles vaccines lagged behind. Vaccinated adults reported fewer infections and had significantly lower adjusted odds of COVID-19 infection compared to unvaccinated adults.²⁰ Asking “Are you up to date on your flu shot, pneumonia vaccine, and shingles vaccine?” takes seconds and can prompt patients to close vaccination gaps they didn’t know they had. For patients who are hesitant, explaining that diabetes weakens certain immune responses and makes infections harder to recover from can be persuasive in a way that generic vaccine messaging is not.

Asking About the Questions You Haven’t Asked

One question that deserves to be asked at every visit, regardless of what else was covered, is an open-ended one: “Is there anything about your diabetes that you’ve been wanting to ask about but haven’t?” Patients often sit on concerns about sexual dysfunction, fears about going blind, confusion about conflicting dietary advice they’ve read online, or worries about whether their children will develop diabetes. These topics rarely fit neatly into a structured assessment, but they weigh heavily on the patient. Giving explicit permission to raise them, even briefly, can surface issues that would otherwise go unaddressed for months or years. The best clinical questioning is not just a checklist; it’s an invitation for the patient to tell you what you didn’t know to ask.