Is Diabetes Affecting Your Heart and Digestion? 5 Red Flags

If you have diabetes, high blood sugar over time can damage nerves throughout your body. When this damage affects the "autonomic" nerves—those that control your heart, blood vessels, digestive tract and more—it's called autonomic neuropathy. Early on, you might barely notice the changes. Left unchecked, however, serious complications can arise.

Below are five key autonomic neuropathy red flags—warning signs that your diabetes may be impacting your heart and digestion. Read through them carefully. If any apply to you, it's wise to get checked. You can take Ubie's free AI-powered symptom checker in just 3 minutes to evaluate your symptoms and receive personalized guidance on next steps. And remember: nothing replaces a face-to-face evaluation by your doctor.

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What Is Autonomic Neuropathy?

Autonomic neuropathy happens when chronically elevated blood sugar injures the autonomic nervous system. This system operates largely outside your awareness, controlling:

• Heart rate and blood pressure
• Breathing patterns
• Body temperature and sweating
• Stomach emptying and bowel movements
• Bladder and sexual function

When these functions go off-kilter, you might feel anything from mild discomfort to dangerous symptoms that require urgent care. Below are five red flags that call for prompt medical attention.

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1. Unexplained Changes in Heart Rate

Why it matters: Your autonomic nerves help regulate your heart's rhythm. Damage can cause resting tachycardia (a fast heartbeat) or an inability to adjust heart rate appropriately when you move, exercise or rest.

Watch for:

• Heart beating over 100 beats/minute at rest
• Skipped or irregular beats you can feel in your chest
• Trouble tolerating mild activity (e.g., climbing stairs leaves you unusually short of breath)

What to do:

• Monitor your resting heart rate first thing each morning for a week.
• Note if rates are consistently elevated or vary wildly.
• Discuss your log with your doctor—untreated tachycardia can strain your heart over time.

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2. Dizziness or Lightheadedness on Standing

Why it matters: Orthostatic hypotension—an abrupt drop in blood pressure when you stand—is a hallmark of cardiovascular autonomic neuropathy. It raises fall risk and can indicate the nervous system isn't adjusting blood vessel tone properly.

Watch for:

• Feeling dizzy, lightheaded or weak within 2 minutes of standing
• Pale skin, blurred vision or fainting spells upon rising
• Heart racing or pounding as your body tries to compensate

What to do:

• When you go from lying to standing, pause on the edge of the bed for 30 seconds before fully rising.
• If dizziness persists, sit down immediately and elevate your feet.
• Keep a log of when and how often this happens—this helps your doctor tailor treatment (e.g., hydration strategies, compression stockings, medication adjustments).

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3. Persistent Nausea, Early Fullness or Bloating

Why it matters: Gastroparesis—delayed stomach emptying—occurs when autonomic nerves to the stomach are impaired. Poor digestion can cause erratic blood sugar swings, malnutrition and discomfort.

Watch for:

• Feeling full after just a few bites
• Frequent nausea or occasional vomiting of undigested food
• Upper abdominal bloating, especially several hours after eating

What to do:

• Eat small, frequent meals rather than large plates of food.
• Choose low-fat, low-fiber foods that are easier to digest (e.g., lean proteins, cooked vegetables, refined grains).
• Keep a food-symptom diary: note what you eat and how you feel afterward. Share this with your healthcare provider to guide dietary changes or prescription medications.

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4. Bowel Irregularities: Constipation or Diarrhea

Why it matters: Autonomic nerves regulate muscle contractions in the intestines. Damage can lead to slowed movement (constipation) or erratic, rapid transit (diarrhea), both of which affect nutrition and quality of life.

Watch for:

• Constipation that doesn't respond to over-the-counter laxatives
• Loose, watery stools, especially at night or early morning
• Alternating patterns of diarrhea and constipation

What to do:

• Maintain consistent meal times and fiber intake (e.g., whole grains, fruits, vegetables).
• Stay well-hydrated—aim for 8 cups of fluid daily unless otherwise directed.
• Talk to your doctor before starting new fiber supplements or anti-diarrheal meds, as dosing may need adjustment based on nerve function.

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5. Abnormal Sweating and Heat Intolerance

Why it matters: Sweating helps regulate body temperature. Autonomic neuropathy can cause too much (hyperhidrosis) or too little (anhidrosis) sweating in certain areas, raising risk for heat-related illness or skin problems.

Watch for:

• Excessive sweating on your palms, face or feet when at rest
• Little or no sweating on your arms, legs or torso even in heat
• Overheating easily during exercise or warm weather

What to do:

• Wear breathable, moisture-wicking clothing.
• Carry a spray bottle of cool water and a towel to dab sweaty areas or help cool down if you overheat.
• Keep an eye on skin integrity—excess moisture or dryness can lead to cracks, infections or rashes.

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Taking Action

Catching autonomic neuropathy early can slow its progression and prevent serious complications. If you're experiencing any combination of these symptoms, try Ubie's AI symptom checker to get a better understanding of what might be happening and help you prepare informed questions for your doctor visit.

When you talk with your doctor, bring notes on:

• How often each red flag occurs
• What you were doing when symptoms started
• Any treatments or home remedies you've tried

Your doctor may recommend:

• Glycemic control improvements (diet, exercise, medication)
• Specialized tests (tilt-table for blood pressure changes, gastric emptying studies)
• Medications to help speed digestion, stabilize heart rate or manage blood pressure

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Final Thoughts

While mild digestive or heart-rate changes can seem harmless at first, they may signal underlying autonomic neuropathy that needs attention. Act sooner rather than later:

• Monitor and document symptoms
• Use Ubie's free symptom assessment tool if you're experiencing multiple warning signs and want to understand your symptoms better before your appointment
• Speak to a doctor about anything that could be life threatening or serious

Early action gives you the best chance to protect your heart, digestion and overall quality of life.