Common Diabetes Complications & How to Avoid Them

Diabetes is a complex condition that affects the way your body handles sugar (glucose), and if left unmanaged, it can lead to severe complications. These complications don’t happen overnight—they are the result of prolonged high blood sugar levels, which gradually damage the body in ways you might not even notice until it’s too late. But why exactly do these complications occur?

High blood sugar levels over time can seriously damage your blood vessels, preventing them from delivering blood to various parts of your body. When this happens, your nerves also suffer, leading to numbness and loss of feeling in areas like your hands, feet, and other extremities. Once blood vessels and nerves in one part of your body are damaged, you’re more likely to experience similar issues in other areas. For example, if your feet are damaged, it’s only a matter of time before more serious problems—like heart issues—arise. In this article, we will explore 11 serious complications of diabetes and provide detailed insights into how to avoid them.

Cardiovascular Diseases

One of the most severe complications of diabetes is cardiovascular disease. Research indicates that people with diabetes are twice as likely to develop heart disease or suffer a stroke compared to those without diabetes. Elevated blood sugar levels over time lead to the thickening of blood vessel walls, promoting plaque buildup that narrows the arteries. This condition, called atherosclerosis, is responsible for a significant percentage of deaths among diabetics. In fact, approximately 68% of adults over 65 with diabetes die from heart disease, and 16% die from stroke.

According to Dr. John Campbell, “Atherosclerosis in the coronary arteries means ischemic heart disease leading to such complications as myocardial infarction is actually the most common cause of death in diabetes.” 

Symptoms of cardiovascular disease in diabetics:

• Chest pain
• Shortness of breath
• Fatigue
• Irregular heartbeat
• Numbness or weakness in arms or legs

Nerve Damage (Neuropathy)

Diabetic neuropathy is a common complication where high blood sugar damages nerves, particularly in the extremities. Over time, nerve fibers can deteriorate, causing pain, numbness, and tingling, especially in the feet and hands. Around 50% of people with diabetes will experience some form of neuropathy.

If left untreated, it can result in severe complications such as ulcers, infections, and even amputations. Studies show that people with diabetes are 15 to 40 times more likely to require a lower-limb amputation due to neuropathy and poor blood circulation.

Dr. Campbell also noted, “Microvascular disease is going to affect the eyes, the kidneys, and it can affect the small nerves leading to neuropathy, ulcers, and ischemic ulcers in the feet.”

Symptoms of diabetic neuropathy:

• Tingling or burning sensation
• Numbness
• Sharp pains or cramps
• Muscle weakness
• Loss of coordination or balance

Kidney Disease (Nephropathy)

Diabetes is one of the leading causes of chronic kidney disease (CKD) and kidney failure. Over time, high blood sugar levels can damage the small blood vessels in the kidneys, reducing their ability to filter waste from the blood. Diabetic nephropathy affects about 20-40% of people with diabetes, and it’s a significant cause of end-stage renal disease, which requires dialysis or a kidney transplant.

Research suggests that tight blood sugar and blood pressure control can reduce the risk of developing kidney disease by 33%. Early signs of kidney damage include protein in the urine, which can be detected with regular screenings.

Dr. Campbell said, “In the UK, the most common cause of end-stage renal failure is diabetic nephropathy. In many Western countries, it is the leading cause of end-stage renal failure.”

Symptoms of kidney disease (often appear in later stages):

• Swelling in the hands, feet, and face
• Fatigue
• Nausea or vomiting
• Difficulty concentrating
• Loss of appetite

Eye Damage (Retinopathy)

Diabetes can severely affect your vision, leading to conditions like diabetic retinopathy. This occurs when high blood sugar damages the blood vessels in the retina. Over time, these vessels can swell, leak, or even close off, potentially leading to blindness. Approximately 99% of patients with type 1 and 66% of patients with type 2 diabetes will develop some form of retinopathy if they have had diabetes for more than 20 years. In fact, diabetic retinopathy is the leading cause of blindness among adults aged 20 to 74.

Symptoms of diabetic retinopathy:

• Blurred vision
• Dark spots or floaters
• Difficulty seeing at night
• Vision loss
• Distorted vision

Foot Problems

Diabetes can lead to a range of serious foot problems, primarily due to poor blood circulation and nerve damage (neuropathy). In fact, about 15% of diabetics will develop a foot ulcer at some point in their lives, which can lead to infections, gangrene, or even amputation if not treated early. Diabetics are 15 to 40 times more likely to undergo a lower-limb amputation compared to non-diabetics. Poor circulation slows down the healing process of even minor foot injuries, and combined with neuropathy, these issues may go unnoticed until they become severe.

Symptoms of diabetic foot problems:

• Swelling in the feet or ankles
• Redness or warmth in certain areas
• Open sores or ulcers
• Pain or tingling sensations
• Infections or foul-smelling wounds

Skin Conditions

People with diabetes are more susceptible to skin conditions due to poor blood circulation and high blood sugar, which can weaken the immune system. Approximately 79.2% of people with diabetes will experience some form of skin disorder, ranging from bacterial and fungal infections to more specific conditions like diabetic dermopathy, which causes brown patches on the skin, and necrobiosis lipoidica, a condition that causes yellow, shiny areas on the skin. Bacterial infections like styes and boils are common, while fungal infections like athlete’s foot and ringworm pose risks. High blood sugar also makes it harder for the body to fight infections, leading to longer healing times for skin injuries.

Symptoms of skin conditions in diabetics:

• Dry, itchy skin
• Dark patches of skin (especially on the neck or armpits)
• Open sores or ulcers
• Red, swollen areas
• Blisters or rashes

Hearing Impairment

Research has found that people with diabetes are twice as likely to experience hearing loss compared to those without the condition. High blood sugar can damage the inner ear’s small blood vessels and nerves, leading to hearing problems. In a large study, about 54% of diabetics were found to have some degree of hearing loss, which may start gradually and worsen over time if blood sugar levels remain uncontrolled.

Symptoms of hearing impairment in diabetics:

• Difficulty hearing conversations, especially in noisy environments
• Frequently asking others to repeat themselves
• Muffled or distorted sounds
• Ringing in the ears (tinnitus)
• Turning up the volume on the TV or radio louder than usual

Erectile Dysfunction (ED)

Erectile dysfunction (ED) is a common but often overlooked complication of diabetes. It affects approximately 20-71% of men with diabetes. Diabetes can cause damage to the blood vessels and nerves that control erections, leading to difficulty in achieving or maintaining an erection. Men with diabetes are up to three times more likely to experience ED compared to men without the condition. Poor blood sugar control can worsen ED, and it can also be an early warning sign of cardiovascular disease.

Symptoms of erectile dysfunction in diabetics:

• Difficulty achieving an erection
• Trouble maintaining an erection during sexual activity
• Reduced sexual desire
• Delayed or reduced ejaculation
• Anxiety or stress related to sexual performance

Digestion Problems

Diabetes can affect the digestive system by damaging the vagus nerve, which controls the muscles in the stomach and intestines. When this nerve is damaged, it disrupts the movement of food through the digestive tract, causing a condition known as gastroparesis. In gastroparesis, the stomach empties too slowly, leading to nausea, vomiting, and bloating. It is estimated that up to 4.8% of people with long-term type 1 diabetes and about 1% of those with type 2 diabetes may experience some form of gastroparesis. High blood sugar levels can worsen this condition, creating a vicious cycle as delayed digestion makes it harder to manage blood glucose levels.

Symptoms of gastroparesis:

• Nausea or vomiting after eating
• Feeling full quickly or after eating only a small amount
• Bloating or discomfort in the abdomen
• Heartburn or acid reflux
• Unpredictable blood sugar levels

Alzheimer’s Disease

Recent studies have indicated a potential link between type 2 diabetes and an increased risk of developing Alzheimer’s disease. People with diabetes are about 60-80% more likely to develop Alzheimer’s or other forms of dementia compared to those without diabetes. The exact cause is still under investigation, but high blood sugar is thought to damage brain cells and contribute to cognitive decline. Some researchers even refer to Alzheimer’s as “type 3 diabetes” due to the way insulin resistance affects brain function.

Symptoms of Alzheimer’s disease in diabetics:

• Memory loss that disrupts daily life
• Difficulty solving problems or completing familiar tasks
• Confusion with time or place
• Trouble understanding visual images or spatial relationships
• Mood changes, including increased anxiety or aggression

Dental Problems

Diabetes can lead to a range of dental issues, as high blood sugar levels increase the risk of infections in the mouth, particularly gum disease (periodontitis). Diabetics are more prone to gum inflammation, which, if untreated, can lead to serious infections and tooth loss. Studies show that people with diabetes are at a higher risk of developing advanced gum disease, and they may experience it more severely than those without diabetes. Elevated glucose levels in the saliva provide an ideal environment for harmful bacteria, increasing the risk of cavities and other oral infections.

Symptoms of dental problems in diabetics:

• Red, swollen, or bleeding gums
• Persistent bad breath
• Loose teeth or receding gums
• Tooth sensitivity or pain
• Frequent mouth infections or sores

Acute Diabetes Complications

Acute complications of diabetes can occur suddenly and, if left untreated, may lead to more severe long-term issues. These complications require immediate attention and management to prevent life-threatening consequences.

According to Cathy Parkes, a Registered Nurse (RN), Certified Wound Care Nurse (CWCN), and Public Health Nurse (PHN), “Left untreated and not managed, diabetes can really ravage the body and cause so many problems.”

Hypos (Hypoglycemia)

Hypoglycemia, or “hypos,” occurs when blood sugar levels drop too low, typically below 70 mg/dL. This can happen due to excessive insulin, skipping meals, or intense physical activity. Common symptoms include shakiness, sweating, confusion, and, in severe cases, seizures or loss of consciousness. Treating hypoglycemia quickly with fast-acting carbohydrates like glucose tablets or sugary drinks can help restore normal blood sugar levels.

Parkes also highlighted the critical symptoms, noting, “The signs and symptoms of hypoglycemia include hunger, irritability, confusion, diaphoresis, headache, shakiness, blurred vision, pale, cool skin, and decreased level of consciousness that could progress into a coma.”

Hypers (Hyperglycemia)

Hyperglycemia, or “hypers,” occurs when blood sugar levels are too high, generally over 180 mg/dL after meals. Causes include missed doses of insulin or medications, consuming too many carbohydrates, stress, or illness. Symptoms include increased thirst, frequent urination, fatigue, and blurred vision. If untreated, chronic hyperglycemia can lead to more serious complications like nerve, kidney, and eye damage.

Hyperosmolar Hyperglycaemic State (HHS)

HHS is a rare but life-threatening emergency that affects people with type 2 diabetes. It occurs when extremely high blood sugar levels (often above 600 mg/dL) cause severe dehydration. HHS can develop over days or weeks, often triggered by illness or infection. Symptoms include extreme thirst, confusion, fever, and dry skin. Without prompt treatment, HHS can lead to seizures, coma, or death. Immediate medical intervention with IV fluids and insulin is necessary to correct the condition.

As Parkes explained, “With HHS, we have very high glucose levels as well as severe dehydration… blood glucose levels will be over 600.”

Diabetic Ketoacidosis (DKA)

DKA is a serious complication that primarily affects people with type 1 diabetes but can also occur in people with type 2 diabetes under certain conditions. DKA develops when the body lacks insulin and begins breaking down fat for energy, leading to a dangerous buildup of ketones in the blood. This condition is typically triggered by missed insulin doses, infection, or stress. Symptoms include nausea, vomiting, abdominal pain, shortness of breath, and fruity-smelling breath. DKA requires emergency treatment with insulin, fluids, and electrolytes to prevent coma or death.

Cathy Parkes also emphasized, “DKA is a life-threatening complication of diabetes that causes increased blood glucose levels as well as ketones in the blood and urine… we’re going to administer IV fluids and insulin.”

How to Reduce the Risk of Diabetes Complications

Reducing the risk of diabetes complications requires consistent, proactive management of blood sugar levels, overall health, and lifestyle factors. Here are detailed strategies to lower the chances of developing severe complications:

Maintain Blood Sugar Control

Maintaining tight control over blood sugar levels is one of the most effective ways to reduce the risk of complications. Studies show that for every 1% reduction in Hemoglobin A1c (a measure of average blood sugar over three months), the risk of long-term complications decreases by 37%.

Monitoring your blood sugar regularly using a glucose meter or continuous glucose monitor (CGM) helps ensure it stays within your target range, typically between 80-130 mg/dL before meals and less than 180 mg/dL two hours after eating. Following your doctor’s recommendations for insulin, oral medications, or both prevent complications like neuropathy, nephropathy, and retinopathy.

Regular Check-Ups

Routine medical exams are essential for early detection and management of potential complications. Schedule the following exams regularly:

• Eye exams to check for diabetic retinopathy
• Foot exams to identify nerve damage or circulation issues
• Kidney function tests to assess how well your kidneys are filtering waste
• Dental check-ups to catch early signs of gum disease
• Regular blood work, including A1c tests and cholesterol panels, can help monitor your overall health and the effectiveness of your treatment plan.

Monitor Blood Pressure and Cholesterol

High blood pressure (hypertension) and elevated cholesterol levels are common in people with diabetes and significantly increase the risk of cardiovascular diseases. Studies indicate that managing these conditions can reduce the risk of heart attacks and strokes by up to 50%. Keeping blood pressure below 140/90 mmHg and LDL (“bad”) cholesterol levels low can protect your heart and blood vessels. Lifestyle changes and medications like statins or ACE inhibitors can help manage these levels.

Follow a Healthy Diet

Diet plays a key role in managing diabetes and reducing complications. Aim for a balanced diet that includes:

• Whole grains like brown rice, quinoa, and whole wheat bread
• Vegetables (especially non-starchy options like leafy greens, broccoli, and peppers)
• Lean proteins such as chicken, fish, and tofu
• Healthy fats like olive oil, avocados, and nuts

Limiting processed foods, sugary drinks, and refined carbohydrates will help stabilize your blood sugar. Monitoring carbohydrate intake and portion sizes is also essential, as large carbs can cause blood sugar spikes.

Stay Active

Physical activity improves insulin sensitivity, allowing your body to use insulin more effectively. Studies show that people with diabetes who engage in regular physical activity, such as walking, swimming, or cycling, experience better blood sugar control and a lower risk of cardiovascular complications. Aim for at least 150 minutes of moderate exercise each week, which can also improve circulation, reduce stress, and help with weight management.

Quit Smoking

Smoking significantly worsens the complications of diabetes by narrowing blood vessels and reducing blood flow, especially to the legs and feet. It also increases the risk of heart disease, stroke, and infections. Quitting smoking can improve circulation and reduce the chances of severe complications like amputation. Research shows that people who quit smoking have a 30% lower risk of heart attack and stroke compared to those who continue smoking.

Manage Stress

Chronic stress raises blood sugar levels by triggering the release of hormones like cortisol and adrenaline. Over time, unmanaged stress can make diabetes harder to control and increase the risk of complications. Techniques such as meditation, deep breathing exercises, yoga, and regular physical activity can help reduce stress and improve blood sugar control. Studies suggest that stress reduction techniques improve blood sugar management by 0.5% in A1c levels.

Medications

Adhering to your prescribed medication regimen is crucial for maintaining blood sugar levels and reducing the risk of complications. The medications prescribed will vary based on the type of diabetes and individual health needs. The main categories of medications include:

• Insulin: Essential for people with type 1 diabetes and sometimes prescribed for those with type 2 diabetes, insulin helps regulate blood sugar levels. Types of insulin include rapid-acting (e.g., Humalog), short-acting (e.g., Novolin R), intermediate-acting (e.g., Humulin N), and long-acting insulin (e.g., Lantus, Toujeo).

• Metformin: This is the most commonly prescribed medication for type 2 diabetes. It helps lower glucose production in the liver and improves the body’s sensitivity to insulin. Examples include Glucophage and Fortamet.

• Sulfonylureas: These medications stimulate the pancreas to release more insulin, helping to lower blood sugar levels. Examples include Glipizide (Glucotrol), Glyburide (Diabeta, Micronase), and Glimepiride (Amaryl).

• SGLT2 Inhibitors: These drugs work by helping the kidneys excrete excess glucose through the urine. Examples include Canagliflozin (Invokana), Dapagliflozin (Farxiga), and Empagliflozin (Jardiance).

• GLP-1 Receptor Agonists: These medications mimic the GLP-1 hormone, which increases insulin production and slows digestion. Common examples include Liraglutide (Victoza), Dulaglutide (Trulicity), Semaglutide (Ozempic), and Exenatide (Byetta, Bydureon).

• DPP-4 Inhibitors: These drugs work by preventing the breakdown of incretin hormones, which are involved in regulating blood sugar. Examples include Sitagliptin (Januvia), Saxagliptin (Onglyza), and Linnagliptin (Tradjenta).

• Thiazolidinediones: These medications improve the body’s sensitivity to insulin and reduce glucose production in the liver. Common examples include Pioglitazone (Actos) and Rosiglitazone (Avandia).

Following your doctor’s prescription and discussing any side effects promptly will help optimize your treatment plan. Studies have shown that combining medication adherence with lifestyle changes can significantly reduce the risk of diabetes-related complications.

Conclusion

Managing diabetes requires constant attention, but by maintaining healthy blood sugar levels, following a balanced lifestyle, and adhering to prescribed medications, the risks of serious complications can be significantly reduced. Early detection and proactive management are key to living a healthier life with diabetes, allowing you to prevent many of these complications before they become life-threatening.

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