Diabetic complications — vision, kidneys, feet, and the cascading effects

Reviewed by a board-certified geriatrician and internal medicine specialist

Most older adults don't have one health problem. They have several, and the conditions interact in ways that no single specialist is tracking. A blood pressure medication worsens arthritis. Depression undermines diabetes management. Pain disrupts sleep, which raises anxiety, which raises blood pressure. Somebody needs to see the whole picture, and in most families, that somebody ends up being you.

The Medical System Isn't Built for This

You're sitting in your father's kitchen with a stack of prescription bottles lined up on the counter. You're trying to understand what each medication is for, and the deeper you dig, the more you realize nobody has actually explained to you how these medicines work together. Your father sees a cardiologist for heart disease. He sees an endocrinologist for diabetes. He sees a rheumatologist for his arthritis. He sees his primary care doctor for everything else. All of these doctors are competent. All of them are trained. And yet there's a disorienting feeling that you're watching multiple specialists each solving their own puzzle while nobody is looking at the whole picture.

Your mother was diagnosed with high blood pressure, so they put her on a medication that works well for that. Three months later, her arthritis pain got worse. She got checked out and there's no new inflammation, nothing physical changed except that the high blood pressure medication was making her retain fluid, which swelled her joints and made the arthritis worse. Nobody connected those dots because nobody was paid to connect those dots. The cardiologist was solving the blood pressure problem. The rheumatologist was responding to the arthritis complaint. Your mother was caught in between, taking medication that solved one problem and created another.

This is the reality of aging in the modern medical system, and it's one of the things nobody warns you about in advance. According to the CDC, approximately 80 percent of adults 65 and older have at least two chronic conditions, and 68 percent have three or more. The CMS reports that beneficiaries with multiple chronic conditions account for 93 percent of Medicare spending. Most older people don't have one disease. They have several. They don't see one doctor. They see many. And the system makes it surprisingly hard for all the doctors to actually see the patient as a whole person rather than as a collection of separate body parts.

The Reality of Multiple Conditions

In the United States, most people over seventy-five have three to five chronic conditions. Some have seven or eight. This isn't unusual. It's the norm. Diabetes and hypertension often appear together. Arthritis and heart disease often appear together. Kidney disease and diabetes appear together. Depression and chronic pain appear together. The conditions cluster. Your aging parent isn't struggling with one thing. They're managing a system of interconnected health problems.

This matters because the medical system is often built around treating single conditions. A cardiologist is an expert in the heart. A nephrologist is an expert in the kidneys. They're excellent at their specialties. But they're not always trained to think about how solving a problem in their specialty might create a problem elsewhere. Or how a medication that's appropriate for one condition might be dangerous combined with another condition.

Your aging parent might be seeing five different specialists, and there's a real possibility that nobody has reviewed all five medication lists together to see if they're going to fight with each other. The American Geriatrics Society maintains the Beers Criteria, a list of medications potentially inappropriate for older adults, specifically because medication interactions and side effects in the context of multiple conditions are so common and so dangerous.

Why Complexity Gets Dangerous

Treating one condition can absolutely worsen another. This happens in ways both obvious and subtle, and until you know to look for it, you don't see it.

The obvious version happens with medications. A blood pressure medication that works well for heart disease but causes fluid retention, which is terrible if someone also has arthritis. A pain medication that works for arthritis but reduces blood flow to the kidneys, which is a problem if someone has kidney disease. A blood thinner for heart disease that interacts with a common pain medication in a way that increases bleeding risk. These interactions happen. They're documented. But they only get caught if someone is actually looking for them.

The subtle version is harder to see. Your mother has depression, which makes it harder for her to manage her diabetes. The depression makes it hard for her to take care of herself, to stick to a diet, to exercise. So her blood sugar gets worse. The worse blood sugar can make depression worse because blood sugar swings affect mood. It's a negative loop, and unless someone recognizes that the depression is part of the diabetes problem and vice versa, treating each condition separately doesn't actually work well. The NIH has published research confirming that depression doubles the risk of poor diabetes outcomes, and that treating depression improves glycemic control.

Your father has arthritis pain so severe that it keeps him from sleeping. The sleep deprivation makes his anxiety worse. The worse anxiety makes his blood pressure higher. Multiple doctors are each treating their piece of this, but nobody sees the actual problem, which is the arthritis, sleep, anxiety, and blood pressure all feeding into each other.

Sometimes treating one condition literally makes another condition worse. A medication given for high blood pressure can cause erectile dysfunction, which affects mood and relationships. A medication for arthritis can cause stomach problems, which affects the person's ability to take their diabetes medication properly. A diuretic can cause electrolyte imbalances that cause dizziness, which causes falls.

The Coordination Problem

The structural problem is that the medical system is organized in a way that makes coordination hard. Different specialists work in different clinics, sometimes in different buildings, sometimes in different healthcare systems entirely. The cardiologist has their electronic health record. The rheumatologist has theirs. These systems might not even communicate with each other.

Your parent goes to the cardiologist and tells them what medications they're on, and the cardiologist notes it in their chart. Your parent goes to the rheumatologist and tells them the same thing, and the rheumatologist notes it differently. By the time your parent talks to their primary care doctor, nobody has actually reviewed all of this together and asked "what does the whole picture look like, and are these medications and treatments actually working together?"

The appointment times don't align. Records don't always synchronize. Information gets lost or doesn't transfer. Your parent might mention something to one doctor that changes how another doctor should be treating them, but that information never reaches the other doctor.

Sometimes your parent doesn't even know which of their dozens of symptoms is caused by which condition, so they can't give the specialists that information. The fatigue might be from diabetes, or from depression, or from heart disease, or from all three. Without someone integrating all of this information, the specialists are working with incomplete pictures.

The Geriatrician Advantage

This is why some families have discovered that seeing a geriatrician, a doctor who specializes in older people and who's trained to look at the whole person rather than at individual organ systems, changes things substantially.

A geriatrician is trained to think about comorbidities. They understand that conditions interact, that medications can fight each other, that treating one condition affects another. They have the training to look at the entire medication list and ask whether every medication is still appropriate given the whole situation.

A geriatrician will ask questions other doctors might not. "Is your parent actually taking all of these the way they're supposed to?" If your parent has cognitive problems or arthritis that makes opening bottles hard, they might not be taking medications correctly, and different specialists might not realize that. "Are all of these medications still appropriate?" Sometimes a medication that made sense five years ago doesn't make sense anymore given how your parent's health has changed. The American Geriatrics Society emphasizes that deprescribing, the careful process of reducing or stopping medications that are no longer beneficial or may be causing harm, is a core skill of geriatric medicine.

A geriatrician also thinks differently about treatment goals. A younger person probably wants aggressive treatment of every condition. For an older person with multiple conditions, sometimes the goal isn't aggressive treatment of everything but rather finding the right balance where your parent feels okay and can function without spending all day managing medical problems.

Geriatricians exist. Some are in private practice. Many are in larger medical centers. If your parent's current system of seeing multiple specialists isn't working well, seeing a geriatrician is worth considering.

Your Role as the Person Who Sees the Whole Picture

Most families won't have access to a geriatrician. Your parent's health insurance might not cover one. There might not be one in your area. In that case, some of the coordination falls to you. It's not ideal. It's not something anyone asked you to do. But it's necessary.

You need to keep the master list. Get a document, paper or digital, and track every condition your parent has been diagnosed with, every medication they're taking including dose and frequency, every doctor they're seeing, every allergy they have. This seems simple, but most families don't have this, and the first time someone asks your parent what medications they're on at an emergency room, you'll find that they either list them from memory inaccurately, forget some, or are confused about doses. Having a master list that you review with your parent, that you update regularly, and that you bring to appointments solves a lot of problems.

You need to connect the dots between conditions. When your parent develops a new symptom or a condition gets worse, ask yourself: could this be related to another condition or to a medication? If your parent's arthritis got worse around the same time a new blood pressure medication started, mention that to their doctor. You're not trying to practice medicine. You're trying to make sure the doctors have the information they need to see the whole picture.

You need to ask the hard questions in appointments. When a new medication is prescribed, ask: could this interact with what they're already taking? When a new condition is diagnosed, ask: how does this interact with their existing conditions? When a medication isn't working as expected, ask: could this be related to their other conditions or other medications?

You need to make sure the primary care doctor, the one who's supposed to be the central coordinator, is actually coordinating. Some do this well. Others are overwhelmed and focus on the acute problem in front of them. If coordination isn't happening, you might need to push. Ask your parent's primary care doctor to review the entire medication list and all conditions and tell you if they think everything is still working well together.

You need to talk to your parent about whether the current treatment approach feels like it's working. Sometimes your parent will tell you things in a quieter moment that they won't volunteer to their doctors. "I think that medication is making me feel weird," or "I feel like I'm getting worse, not better." These conversations matter. They're information. And sometimes they point to the fact that the overall approach needs to change.

It's not a perfect system. You're not trained for this. But having one person who knows the whole picture, who's asking questions, who's making sure information gets transferred between specialists, that person makes a real difference in whether your aging parent is actually well-managed or caught in a system where different treatments are working against each other.

Frequently Asked Questions

How do I create and maintain a medication list for my parent?
Start with all the prescription bottles in the house. Write down the medication name, dose, frequency, prescribing doctor, and what it's for. Include over-the-counter medications, vitamins, and supplements. Update it every time a medication changes. Bring a printed copy to every doctor visit and every ER visit. Several free apps can help manage this, or a simple spreadsheet works.

What is a geriatrician, and how do I find one?
A geriatrician is a doctor who completed additional training in caring for older adults with complex, multiple conditions. They're trained to look at the whole person rather than one organ system. The American Geriatrics Society's Health in Aging Foundation maintains a searchable directory. Your parent's insurance company can also provide a list of covered geriatricians in your area.

Can I ask my parent's doctor to reduce their medications?
Yes. Deprescribing is an established and evidence-based practice in geriatric medicine. Ask the doctor to review every medication and explain whether each one is still necessary, still at the right dose, and still appropriate given your parent's current health. Sometimes medications started years ago are no longer beneficial and may be causing side effects that are being treated with additional medications.

What should I do if I think a new medication is causing problems?
Don't stop the medication without medical guidance, but do contact the prescribing doctor promptly. Describe what you're seeing, when it started, and whether the timing lines up with starting the new medication. The doctor can adjust the dose, switch to a different medication, or determine whether something else is causing the symptoms.

How do I get different specialists to communicate with each other?
Ask each specialist to send their notes and recommendations to the primary care doctor after every visit. Bring your master medication and condition list to every appointment. If specialists are in different health systems, you may need to physically carry records between them. Some families designate one person to attend all appointments and serve as the information bridge.