What Are the Signs of Insulin Resistance?

Insulin resistance often has no obvious signs at first, which is why many people have it for years without knowing. When signs do appear, the most recognizable physical ones are extra weight around the middle, darkened velvety patches of skin on the neck or in the armpits (acanthosis nigricans), and skin tags. On lab work, rising fasting glucose or A1C, high triglycerides, low HDL cholesterol, and high blood pressure can point toward it.

Many people also notice everyday patterns before any lab changes: feeling tired or foggy after meals, strong cravings for sweets or starches, and trouble losing weight despite real effort. These patterns are common and can have other causes, so they are not proof of insulin resistance on their own. But they are worth taking seriously, especially when several show up together. Standard labs often stay in the normal range for years while your pancreas makes extra insulin to compensate, and a dedicated insulin resistance test is mainly used in research. Being told your labs look fine does not always mean nothing is going on.

The signs also tend to show up alongside stress your body is under that you may not recognize as stress, such as short or broken sleep, ongoing digestive problems, chronic inflammation, and years of emotional strain. These raise stress hormones that work against insulin. Looking at the full pattern, not one symptom or one lab value, gives the clearest picture of whether insulin resistance is part of what you are feeling.

Key Points

  • It is often silent: Many people have no noticeable signs while their pancreas is still making enough extra insulin to keep blood sugar normal.

  • Skin can give early clues: Darkened, velvety skin on the neck, armpits, or other folds (acanthosis nigricans) and skin tags are linked to insulin resistance and prediabetes.

  • Belly fat is both a sign and a driver: Excess fat around the middle is one of the strongest contributors to insulin resistance, and insulin resistance makes that fat easier to store.

  • Lab patterns matter more than one number: High triglycerides, low HDL cholesterol, high blood pressure, and rising fasting glucose or A1C together suggest insulin resistance more strongly than any single value.

  • Everyday patterns are worth noticing: Tiredness after meals, strong cravings for sweets or starches, and stalled weight loss are commonly reported, but they can have other causes.

  • Normal labs do not rule it out: Routine tests often stay normal for years, and direct insulin resistance testing is mainly used in research.

  • Hidden stressors often travel with it: Short sleep, chronic stress, ongoing inflammation, and certain conditions and medications can cause or worsen insulin resistance.

  • Signs of diabetes need prompt care: Increased thirst, frequent urination, blurred vision, and slow-healing sores mean blood sugar may already be high.

Understanding Insulin Resistance

Insulin is a hormone made by your pancreas. It moves glucose (sugar) from your blood into your cells, where it is used for energy or stored. Insulin resistance means the cells in your muscles, fat, and liver stop responding well to insulin. Your pancreas makes more insulin to keep blood sugar in range. This extra insulin in the blood is called hyperinsulinemia.

While the pancreas keeps up, blood sugar stays normal and you may feel nothing unusual. This stage can last for years. Over time, the pancreas can struggle to keep up, and blood sugar starts to rise. Blood sugar that is higher than normal but not high enough to be called diabetes is prediabetes. Without changes, prediabetes can progress to type 2 diabetes.

This is why the signs of insulin resistance are easy to miss. The early stage shows up mostly as subtle changes in how you feel, how your body stores fat, and what your skin looks like. The later stage shows up on labs. Waiting for lab values to cross a threshold means waiting until the problem has progressed.

Insulin resistance is closely tied to metabolic syndrome, a cluster of conditions that includes a large waistline, high blood pressure, high blood sugar, high triglycerides, and low HDL cholesterol. Metabolic syndrome is also called insulin resistance syndrome. Having several of these together raises the risk of heart disease, stroke, and diabetes.

Stress plays a larger role than most people realize. During stress, your body releases cortisol and adrenaline, which raise blood sugar and counteract insulin. When stress is constant, whether from emotional strain, short sleep, or ongoing inflammation, that response keeps working against insulin day after day. Conditions that raise cortisol, such as Cushing syndrome, and medications such as steroids can cause insulin resistance directly.

Signs to Watch For

Physical signs

  • Extra weight around the middle: Excess belly fat, especially the deep fat around your organs, is one of the main contributors to insulin resistance. A waistline that keeps growing while the rest of your body changes less is a common pattern.

  • Darkened, velvety skin: Acanthosis nigricans appears as darker, thicker patches in body folds, most often on the back and sides of the neck and in the armpits.

  • Skin tags: Small, soft growths on the neck, armpits, or eyelids are linked to insulin resistance and prediabetes.

Lab patterns

No single routine test measures insulin resistance directly. Your provider looks at a pattern across several results:

  • Fasting glucose and A1C: A fasting glucose of 100 to 125 mg/dL or an A1C of 5.7% to 6.4% falls in the prediabetes range. Values creeping upward within the normal range can also be meaningful.

  • Fasting insulin: This test is not part of most routine panels, so it often has to be requested. Insulin often rises years before blood sugar does, because the body makes more insulin to keep glucose in a normal range. A high fasting insulin with a normal fasting glucose can be an early sign of insulin resistance. Fasting glucose and fasting insulin can also be combined into a score called HOMA-IR to estimate how hard your body is working to control blood sugar.

  • High triglycerides and low HDL cholesterol: This combination often travels with insulin resistance.

  • High blood pressure: Part of the same metabolic cluster.

Everyday patterns many people notice

These are not formal diagnostic signs, and each can have other causes. They are worth paying attention to when several show up together:

  • Feeling tired, sleepy, or foggy after meals, especially meals heavy in starches or sugar

  • Strong cravings for sweets or starches, or feeling hungry again soon after eating

  • Trouble losing weight, particularly around the middle, despite consistent effort

  • Energy that swings up and down through the day

Conditions and situations that raise the likelihood

  • Polycystic ovary syndrome (PCOS): Closely linked to insulin resistance.

  • Sleep apnea: Loud snoring, gasping during sleep, or heavy daytime sleepiness.

  • A history of gestational diabetes: Raises the long-term risk of insulin resistance and type 2 diabetes.

  • Family history: A parent or sibling with prediabetes or type 2 diabetes.

  • Inactivity: Muscle that is not used regularly takes up less blood sugar.

  • Certain medications: Long-term steroids, some antipsychotics, and some HIV medications can cause insulin resistance.

  • Hormone and thyroid conditions: Low thyroid function and Cushing syndrome can both contribute.

The hidden stressors behind the signs

The signs above tell you something is off. They do not tell you why. In many people, the drivers include stress the body is under that is easy to overlook: short or broken sleep, years of emotional strain, ongoing digestive problems, chronic inflammation, and blood sugar swings from skipped or unbalanced meals. These raise stress hormones that work against insulin. Identifying them is often what turns a list of symptoms into a plan that works.

How Agape evaluates insulin resistance

At Agape Integrative Medicine, the first step is understanding your full health story: when your energy, weight, cravings, or skin started to change, what you have already tried, and what is happening with your sleep, stress, and digestion. Laboratory testing, including blood chemistry, thyroid testing, and metabolic markers, is used when it helps answer a specific question, and results are reviewed as a pattern rather than one number at a time. From there, you get a personalized plan that addresses your specific drivers and an explanation of why each recommendation is being made. If you recognize several of these signs, you can book a new patient appointment.

Who It’s For and Who Should Be Cautious

This information is most useful for adults who recognize several of these signs, have a family history of type 2 diabetes, have been told their blood sugar is “borderline,” or feel that something has changed despite normal labs. It is also relevant for people with PCOS, a history of gestational diabetes, sleep apnea, or a waistline that keeps growing. People who want to understand why these signs are showing up, not only whether a lab value is in range, tend to do well with Agape’s functional medicine approach.

Some caution applies when reading your own signs. Fatigue, cravings, and weight changes have many possible causes, including thyroid problems, anemia, depression, sleep disorders, and medication side effects, so they should be evaluated rather than assumed to be insulin resistance. Skin changes that appear suddenly or spread quickly should be checked by a medical provider, because in rare cases they can signal other conditions. If you already have a diabetes diagnosis or take medication that lowers blood sugar, keep working with your prescribing provider on monitoring and treatment.

Risks, Side Effects, and Monitoring

Leaving insulin resistance unaddressed raises the risk of prediabetes, type 2 diabetes, metabolic syndrome, fatty liver disease, and heart disease. Not everyone with insulin resistance develops these complications, but the risk grows the longer it goes unrecognized.

Self-assessment has limits. Online checklists and home devices can raise useful questions, but they cannot confirm insulin resistance or rule out other causes of your symptoms. Supplements marketed to “balance blood sugar” can interact with prescription medications and should be reviewed with your provider before you start them.

Monitoring works best as a pattern over time. Fasting glucose, A1C, and cholesterol and triglyceride levels, rechecked at reasonable intervals, show which direction your metabolism is heading. Changes in your waist measurement, energy after meals, cravings, and sleep quality are also useful to track, and they often shift before labs do.

These are individualized decisions best made with a knowledgeable provider. Medications should not be started, stopped, or combined without guidance from the provider who prescribes them.

Safety

See a medical provider promptly if you notice increased thirst, frequent urination, increased hunger, blurred vision, headaches, unexplained weight loss, frequent vaginal or skin infections, or cuts and sores that heal slowly. These can be signs that blood sugar is already high or that diabetes has developed.

Get urgent care or call 911 if high blood sugar symptoms come with nausea, vomiting, abdominal pain, fruity-smelling breath, rapid breathing, confusion, or extreme drowsiness.

If you take a medication that lowers blood sugar and you feel shaky, sweaty, confused, or notice a racing heartbeat, you may have low blood sugar. Follow your provider’s instructions for treating it. Call 911 if someone becomes severely confused, has a seizure, or cannot respond.

Rapid weight gain in your face, upper back, and abdomen, along with purple stretch marks, easy bruising, or muscle weakness, needs medical evaluation for hormonal causes such as excess cortisol. Dark skin patches that appear suddenly or spread quickly also need prompt evaluation.

If stress, low mood, or anxiety feels unmanageable, reach out to a mental health professional. If you are in crisis in the U.S., call or text 988 for the Suicide & Crisis Lifeline, or call 911.

Do not stop or change any prescribed medication on your own.

Sources and Citations

Reviewed By Dr. Jordan Robertson, DC
Last updated: October 2026