Diabetes is a chronic endocrine condition that affects how the body transforms consumed food into energy. At its core, it involves a breakdown in the regulation of blood sugar (glucose). When this important system is disrupted, glucose can build up in the bloodstream instead of entering the body’s cells, where it is needed for energy.
The pancreas—a large, glandular organ in the abdomen—plays a central role in this process. Specialized cells within the pancreas produce insulin, a hormone that essentially acts like a key, allowing glucose to move from the bloodstream into the cells. In some forms of diabetes, the body does not produce enough insulin, which is known as insulin deficiency. In others, the body produces insulin but does not use it effectively, a condition called insulin resistance. In either case, the pancreas may struggle to keep up with the body’s increased demand for insulin, leading to progressively higher blood glucose levels (hyperglycemia).
Persistently elevated blood glucose can damage the vascular system, including both large blood vessels and tiny capillaries. This is why diabetes can affect nearly every organ system in the body. The eyes, kidneys, heart, brain and nerves are particularly vulnerable to its effects. Without careful management, diabetes can quietly progress for years before complications become apparent.
Diabetes is common and its incidence continues to rise in the United States. Currently, more than 37 million Americans are living with some form of diabetes, and approximately 1.4 million new cases are diagnosed each year. Risk patterns can vary based on age, pregnancy history and other health factors, although the conditions disproportionately affect people with a family history of diabetes and those who are overweight or obese.
Because diabetes can affect vision, circulation, kidney function and cardiovascular health, comprehensive care is essential. Effective management often involves a team of endocrinologists, cardiologists, ophthalmologists, podiatrists, dietitians and behavioral health specialists working together. With the right multidisciplinary approach, many people with diabetes can maintain a full, active lifestyle.
What Are the Types of Diabetes?
Diabetes is not a single medical condition. Rather, it is a group of metabolic disorders that share a common feature: elevated blood glucose. The underlying causes and progression can vary by type, which is why an accurate diagnosis is critical to ensure effective treatment.
The types of diabetes include:
Type 1 Diabetes
Type 1 diabetes is an autoimmune condition that occurs when the body’s immune system mistakenly attacks and destroys insulin-producing beta cells in the pancreas. This can lead to little or no insulin production. Although the condition is most often diagnosed in children and young adults, it can occur at any age. People with Type 1 diabetes require lifelong insulin therapy.
Type 2 Diabetes
Type 2 diabetes arises when the body becomes resistant to insulin and the pancreas cannot produce enough to overcome that resistance. Though strongly associated with genetics, excess body weight and a sedentary lifestyle, this type of diabetes can also occur in individuals without any risk factors. The condition often develops gradually and may go undiagnosed for years.
Gestational Diabetes
Gestational diabetes can occur during pregnancy if hormonal changes interfere with the effectiveness of insulin. Although the condition usually resolves after delivery, it can increase the mother’s long-term risk of developing Type 2 diabetes. It may also affect the baby’s growth and blood sugar stability after birth.
Prediabetes
Prediabetes is a state in which blood glucose levels are higher than normal but not high enough to meet the criteria for diagnosing diabetes. However, it is a warning sign that insulin resistance is developing. Early intervention with lifestyle changes can often prevent or delay its progression to Type 2 diabetes.
Latent Autoimmune Diabetes in Adults (LADA)
LADA is a slow-progressing form of autoimmune diabetes that shares features of both Type 1 and Type 2 diabetes. The condition usually develops during adulthood. Initially, it may be misdiagnosed as Type 2 diabetes, but the patient may eventually require insulin therapy if their pancreatic function declines.
Type 3c Diabetes (Pancreatic Diabetes)
Type 3c diabetes results from damage to the pancreas due to chronic pancreatitis, pancreatic cancer or surgical removal of part of the organ. Because the pancreas is directly impaired, both insulin production and digestive enzyme function may be affected.
Monogenic Diabetes
Unlike other forms of diabetes, monogenic diabetes occurs due to a mutation in a single gene. The condition is relatively rare and often diagnosed in infancy, childhood or early adulthood. Genetic testing can help confirm the diagnosis and guide treatment decisions.
Causes and Risk Factors for Diabetes
Diabetes may occur due to a combination of genetic, environmental and lifestyle factors. While the exact cause can vary depending on the type, several risk factors can increase the likelihood of developing diabetes. These include:
- Advanced age – Insulin sensitivity tends to decrease over time, especially after age 45 when other risk factors are present.
- Autoimmune disease – In Type 1 diabetes, immune system dysfunction targets pancreatic cells.
- Excess body weight – Increased fatty tissue, particularly around the abdomen, can contribute to insulin resistance.
- Family history of diabetes – Genetic traits can influence insulin production and how the body responds to insulin.
- Pancreatic disease or surgery – Direct damage to insulin-producing cells in the pancreas can reduce insulin availability.
- Physical inactivity – Regular movement helps muscles use glucose efficiently, reducing insulin resistance.
- Pregnancy-related hormonal changes – Placental hormones can block the action of insulin, leading to gestational diabetes.
What Are the Signs and Symptoms of Diabetes?
Diabetes is a systemic metabolic disorder that affects how the body processes carbohydrates, fats and proteins. As blood glucose rises, cells may struggle to access energy, which can influence heart rate, hydration status, energy levels and even growth and development in children. Because the condition frequently affects multiple bodily systems at once, the early warning signs can be subtle and easily misattributed to stress, the effects of aging or other health issues. What’s more, the symptoms often develop gradually, particularly in Type 2 diabetes.
Common signs and symptoms of diabetes include:
- Blurred vision
- Fatigue
- Frequent urination
- Increased thirst
- Numbness or tingling sensations in the hands or feet
- Recurrent infections
- Slow-healing wounds
- Unexplained weight loss
What Does Diabetes Feel Like?
Internally, diabetes may feel like persistent exhaustion that does not improve with rest. Some people describe feeling foggy, shaky or irritable when their blood glucose fluctuates. Rapid changes in blood sugar can also cause sweating, heart palpitations and lightheadedness.
Due to the associated hormonal imbalances, diabetes can also affect mood. Anxiety and depression are common in people with diabetes, partly due to physiological shifts and the emotional weight of managing a chronic medical condition. Addressing mental health is an important aspect of comprehensive diabetes care.
What Does Diabetes Look Like?
Visible signs of diabetes may include unintended weight gain or loss, dry skin and recurrent skin infections. Darkened, velvety patches of skin (acanthosis nigricans) can also signal insulin resistance.
In some endocrine disorders that affect glucose regulation, such as Cushing’s syndrome, elevated cortisol levels may cause fat redistribution, leading to features sometimes described as a “moon face” or “buffalo hump.” These physical markers can provide important diagnostic clues.
How Is Diabetes Diagnosed?
Diagnosing diabetes requires a careful clinical evaluation supported by precise laboratory testing. Because the symptoms may be subtle, blood work often plays a central role in the diagnostic process. The physician will generally consider the patient’s medical history, physical examination findings and laboratory values together to make an accurate diagnosis.
Lab Tests Used to Diagnose Diabetes
Several blood tests may be used to confirm diabetes or monitor its progression:
- Autoantibody testing – Helps distinguish Type 1 diabetes from Type 2 or LADA
- C-peptide test – Assesses how much insulin the body is producing
- Fasting plasma glucose test – Measures blood sugar after an overnight fast
- Hemoglobin A1c (HbA1c) test – Reflects average blood glucose levels over the previous two to three months
- Oral glucose tolerance test – Measures the body’s response to a standardized glucose drink
- Random plasma glucose test – Measures blood sugar at any time, regardless of meals
Imaging Tests Used to Diagnose Diabetes
Imaging is not routinely required for a standard diabetes diagnosis, but it may be used to investigate underlying causes and complications. Options may include:
- Abdominal ultrasound – Can evaluate the pancreatic structure in suspected Type 3c diabetes
- Computed tomography (CT) or magnetic resonance imaging (MRI) scan – May reveal pancreatic tumors, inflammation or structural abnormalities
- Retinal imaging – Can detect early signs of diabetic retinopathy
Procedures Used to Diagnose Diabetes
In select cases, a procedure may be performed to help clarify a complex presentation of diabetes. Options may include:
- Continuous glucose monitoring trial – Assesses glucose patterns over several days
- Fine needle aspiration (FNA) biopsy – Can evaluate a suspicious pancreatic mass
- Nerve conduction studies – Can check for diabetic neuropathy
How Is Diabetes Treated?
Diabetes treatment is designed to maintain blood glucose within a targeted range while reducing the risk of complications. The approach is highly individualized based on the type of diabetes and the patient’s overall health and preferences.
While some forms of diabetes can be put into remission—particularly early Type 2 diabetes with significant lifestyle changes—most types require long-term management. Type 1 diabetes requires lifelong insulin therapy.
Lifestyle Changes
Lifestyle modifications form the foundation of diabetes care. Many patients benefit from a structured nutrition plan, regular physical activity, weight management and smoking cessation. If needed, even modest weight loss can significantly improve insulin sensitivity.
Insulin Therapy
Insulin therapy replaces or supplements the body’s natural insulin. It may be delivered through injections, an insulin pen or an insulin pump. Advanced technologies, such as continuous glucose monitors and hybrid closed-loop systems, can help optimize control.
Medication-Based Management (Noninsulin)
Noninsulin medications for diabetes include oral and injectable agents that can improve insulin sensitivity, increase insulin secretion, reduce glucose production in the liver or slow carbohydrate absorption. Drug classes include metformin, GLP-1 receptor agonists and SGLT2 inhibitors.
What to Expect During Diabetes Treatment
Many people start to feel better within a few days to weeks of achieving improved glucose control. Increased energy and reduced thirst often occur first. Long-term benefits, such as improved A1c levels and reduced complication risk, usually develop over several months. Ongoing follow-up care will be essential to ensure the treatment plan is adjusted as needed.
What Are the Possible Complications of Diabetes?
If left untreated, chronic hyperglycemia can quietly and progressively damage blood vessels and nerves throughout the body. Over time, excess glucose circulating in the bloodstream can trigger inflammation, oxidative stress and structural changes in both large arteries and tiny capillaries. Because these changes often develop gradually, they may not become apparent until a significant injury has already occurred. Possible complications of diabetes include:
Cardiovascular Disease
Diabetes can significantly increase the risk of heart disease by accelerating atherosclerosis, the buildup of plaque in the arteries. Elevated glucose contributes to inflammation and endothelial dysfunction, making blood vessels more prone to narrowing and clot formation. As a result, individuals with diabetes are at higher risk for heart attack, stroke and peripheral artery disease (PAD). Managing blood glucose, blood pressure and cholesterol together is essential to reducing this risk.
Diabetic Foot Complications
Reduced circulation and diminished nerve sensation can make the feet especially vulnerable to complications of diabetes. Even a minor cut, blister or pressure point can develop into an ulcer if not promptly treated. Poor blood flow can slow healing and high glucose levels can impair immune response, significantly increasing the risk of serious infection. In severe cases, an untreated foot ulcer may lead to a deep tissue infection or bone involvement, sometimes requiring hospitalization or surgical intervention. Regular foot exams, proper footwear and daily self-inspections are key components of prevention.
Diabetic Nephropathy
Diabetic nephropathy occurs when persistently high blood glucose damages the delicate filtering units of the kidneys (glomeruli). These structures are responsible for removing waste and excess fluid from the blood while retaining essential proteins. As the damage progresses, small amounts of protein, particularly albumin, may begin to leak into the urine, a condition known as microalbuminuria. Without intervention, kidney function can steadily decline, potentially leading to chronic kidney disease and, in advanced cases, kidney failure requiring dialysis or transplantation. Diabetes is one of the leading causes of end-stage renal disease in the United States. Early detection through urine and blood testing is critical to slowing its progression.
Diabetic Neuropathy
Diabetic neuropathy refers to nerve damage caused by prolonged exposure to high blood glucose. Excess glucose can impair blood flow to nerves and disrupt their normal signaling function. Peripheral neuropathy, the most common form, typically affects the feet and legs first. Symptoms may include burning pain, tingling sensations, numbness and weakness. Loss of sensation is particularly concerning because it can make injuries less noticeable, potentially increasing the risk of infection. Other forms of neuropathy can affect digestion, bladder function, heart rate and blood pressure regulation.
Diabetic Retinopathy
Diabetic retinopathy develops when high blood glucose weakens the small blood vessels in the retina, the light-sensitive tissue at the back of the eye. In early stages, the damaged vessels may leak fluid or small amounts of blood, causing swelling and subtle vision changes. As the condition advances, abnormal blood vessels may form, increasing the risk of bleeding, retinal detachment and permanent vision loss. Because early retinopathy may not cause noticeable symptoms, routine dilated eye exams are essential. With timely treatment, which may include medication or laser therapy, its progression can often be slowed or prevented.
Can Diabetes Be Prevented or Detected Early?
Type 1 diabetes cannot currently be prevented, though research continues. Type 2 diabetes and gestational diabetes can often be prevented or delayed with positive lifestyle changes, such as weight management, healthy eating and regular exercise. Routine screenings and early detection are critical, especially for individuals with risk factors. Identifying prediabetes can provide an opportunity for timely intervention.
How Can Diabetes Be Managed?
Effective diabetes management requires daily attention, informed decision-making and coordinated medical care. Because diabetes affects multiple organ systems and fluctuates in response to food, activity, stress and illness, successful management is both proactive and adaptive. With the right tools, education and clinical support, the patient may be able to maintain stable glucose levels, reduce the risk of complications and protect long-term health.
Diabetes management is individualized. The care plan will be tailored to the type of diabetes and the patient’s age, lifestyle, coexisting conditions and personal goals. Over time, treatment strategies may evolve as insulin production, insulin resistance and overall health status change. Common approaches include:
A1c Testing Every Three to Six Months
The A1c test reflects average blood glucose levels over the previous two to three months. Regular testing can allow the physician to assess overall diabetes control and determine whether current therapies are effective. If A1c levels are above target, the physician may recommend medication adjustments or lifestyle modifications to help reduce the risk of long-term vascular complications.
Blood Pressure and Cholesterol Control
Diabetes significantly increases the risk of heart disease. Managing blood pressure and lipid levels through lifestyle changes and, when necessary, medication can help protect the heart, brain and blood vessels. Comprehensive diabetes care addresses these risk factors alongside glucose management to reduce overall cardiovascular risk.
Consistent Physical Activity
Physical activity increases insulin sensitivity and helps muscles use glucose more efficiently. Both aerobic exercise, such as brisk walking or cycling, and resistance training can provide metabolic and cardiovascular benefits. Even moderate, consistent movement can lower blood glucose levels and improve overall health. The exercise plan should be individualized to help ensure safety and sustainability.
Medication Adherence
Taking insulin or noninsulin medications exactly as instructed is essential for maintaining targeted glucose ranges. Skipping doses, altering schedules or discontinuing medication without medical guidance can destabilize blood sugar control. Regular follow-up with the physician can help ensure prescribed medications remain aligned with the patient’s evolving clinical needs.
Regular or Continuous Blood Glucose Monitoring
Monitoring blood glucose provides immediate insight into how the body responds to meals, exercise, medication and stress. Traditional fingerstick testing offers point-in-time readings, while continuous glucose monitors track glucose levels throughout the day and night, revealing trends and patterns. These data can help guide daily decisions and inform longer-term treatment adjustments.
Routine Eye, Foot and Kidney Exams
Because diabetes can damage small blood vessels and nerves, preventive screenings are critical. Annual dilated eye examinations can help detect early retinopathy. Routine foot exams can assess circulation and nerve function, reducing the risk of ulcers and infection. Kidney function tests can identify early signs of nephropathy, allowing for timely intervention.
Stress Management and Mental Health Support
Stress hormones, particularly cortisol, can raise blood glucose levels and interfere with metabolic control. In addition, the daily demands of diabetes self-management can contribute to burnout, anxiety or depression. Integrating mental health support, counseling or structured stress-reduction techniques into the care plan can strengthen the patient’s emotional well-being and physiological stability.
Structured Meal Planning and Carbohydrate Counting
Carbohydrates have the most direct impact on blood glucose. Learning how to count carbohydrates and balance them with protein, fiber and healthy fats can help prevent rapid spikes and crashes. Structured meal planning can support steady energy levels and improved metabolic stability. Many patients benefit from working with a registered dietitian or certified diabetes educator to develop a sustainable, personalized nutrition strategy.
With consistent monitoring, coordinated specialty care and patient engagement, diabetes can be effectively managed. A comprehensive, multidisciplinary approach can support both immediate symptom control and long-term protection against complications.
TGH’s Approach to Diabetes
Recognized as a global leader in diabetes research, Tampa General Hospital’s Endocrinology Institute offers comprehensive, patient-centered care delivered by a multidisciplinary team of endocrinologists, diabetes educators, dietitians and behavioral health specialists. In partnership with the USF Health Diabetes and Endocrinology Program, TGH provides advanced diagnostic and therapeutic services, including insulin pump therapy, continuous glucose monitoring and specialized care for complex endocrine disorders. Through extensive collaboration with our academic and industry affiliates, we are continually advancing the techniques and technologies needed to better enable our patients to manage their condition and ultimately prevent and cure diabetes.
Take the next step toward expert endocrine care at Tampa General Hospital’s Endocrinology Institute. To schedule an appointment or learn more about becoming a patient, call (855) 566-3627 or connect with one of our specialists. TGH is nationally ranked by U.S. News & World Report and remains deeply committed to serving the Tampa Bay community with leading-edge care and research-driven innovation.