Autonomic Neuropathy

Autonomic neuropathy is diabetes damaging the nerves that run the body on autopilot. These nerves control heart rate, blood pressure, digestion, sweating and bladder function. Patients rarely link these symptoms to their feet. Doctors rarely ask.

Why it goes unrecognized

Nothing about it looks like neuropathy. A patient tells one doctor about dizziness on standing. He tells another about feeling full too soon after meals. He tells a third about sweating with no clear cause. Each one is investigated on its own. The single cause behind all three is rarely found, because nobody asks all three questions in the same room.

What it actually produces

Cardiovascular

Dizziness or graying-out on standing, because blood pressure fails to adjust. A resting heart rate that stays high and does not vary. Less ability to exercise. Most important of all, reduced or absent chest pain during a cardiac event. Silent ischemia (a heart starved of blood with no warning pain) is a known danger in diabetic autonomic neuropathy. So when someone in this group is short of breath or tired for no clear reason, we take it seriously.

Digestive

Gastroparesis (a stomach that empties too slowly) causes early fullness, bloating, nausea and blood sugar you cannot predict. That last part is a real trap. When food is absorbed at random times, timing insulin becomes nearly impossible. The swings that follow often get blamed on the patient not following the plan. Diarrhea, especially at night, and constipation both happen.

Sweating and skin

Less sweating in the feet. That dries and cracks the skin and raises the risk of ulcers. Heavy sweating elsewhere to make up for it, often in the upper body. Sometimes eating triggers sweating.

Bladder and sexual function

A bladder that does not fully empty, less sense of when it is full, and urinary infections that keep coming back. Erectile dysfunction is often the earliest autonomic sign in men. It is also often the one nobody mentions.

What can be done

• Glucose stabilization. It slows the disease, and it is the only thing that addresses the cause.
• Orthostatic symptoms: stand up slowly, get enough salt and fluid when that fits, use compression stockings, and review drugs that lower blood pressure.
• Gastroparesis: smaller, lower-fat meals, and teamwork with whoever manages your diabetes, because insulin timing has to change.
• Foot skin: moisturize on purpose where sweating is low, because dry, cracked skin lets germs in.
• Medication review, since many drugs worsen dizziness on standing and several slow stomach emptying.

We treat the pain side of diabetic neuropathy. On the autonomic side, we work with other doctors rather than manage it alone. Heart and gut specialists have the right tools. What we can do is spot it, name it, and make sure it is not investigated as four unrelated problems. See diabetic neuropathy.

To get checked, call or text us. We are at 12174 Natural Bridge Rd, Suite 110, St. Louis, MO 63044.

Sources

• Eleftheriadou A et al. Cardiovascular autonomic neuropathy in diabetes: an update with a focus on management. Diabetologia, 2024. PubMed 39120767
• Agashe S et al. Cardiac Autonomic Neuropathy in Diabetes Mellitus. Methodist DeBakey cardiovascular journal, 2018. PubMed 30788010
• Dineen J et al. Autonomic Neuropathy. Seminars in neurology, 2015. PubMed 26502768
• Zilliox LA et al. Is there cardiac autonomic neuropathy in prediabetes?. Autonomic neuroscience : basic & clinical, 2020. PubMed 33011523