Why the kidneys matter to a wound
Kidney disease and wound healing may not seem connected, but they are. The kidneys filter waste from the blood, balance fluid and minerals, and help the body make red blood cells. When they work poorly over months or years, which is called chronic kidney disease, the effects reach the skin.
Kidney disease can slow healing in several ways:
- Waste buildup. Waste products that stay in the blood interfere with the cells that fight infection and rebuild tissue.
- Anemia. Fewer red blood cells means less oxygen reaches the wound.
- Extra fluid. Swelling in the legs stretches skin and slows repair.
- Nutrition. Poor appetite, changes in taste and diet limits can leave the body short on building material.
- Blood vessels. Kidney disease often comes with diabetes and high blood pressure, and stiff, narrowed arteries bring less blood to the feet.
- Skin changes. Skin is often dry and itchy, and scratching opens it.
Our guide on why some wounds heal slowly covers other common causes.
If you are on dialysis
Dialysis shapes daily life in ways that matter for a wound:
- Time and energy. Treatments at a center often take up several days a week and can leave you worn out. Wound visits need to fit around them.
- Hours in a chair. Long sessions put steady pressure on the tailbone and heels. Tell the dialysis staff about any wound or sore spot, and ask about cushions and position changes. See heel and foot pressure ulcers.
- Fluid swings. Legs may swell between treatments and shrink afterward, which changes how wraps and shoes fit.
- Your access. A fistula, graft or catheter needs protection. Report redness, drainage, swelling or bleeding at the site to the dialysis team right away.
Eating for healing with kidney limits
This is where advice can seem to collide. Wound healing calls for protein. Kidney diets may limit protein for some people and raise it for others, especially those on dialysis. Many people also have limits on potassium, phosphorus, sodium or fluids.
Because of that, do not add protein powders, nutrition shakes or salt substitutes without asking. Some are high in potassium or phosphorus. A renal dietitian can build a plan that supports healing within your limits. See eating for wound healing for the general ideas and nutrition and healing for how a clinician looks at it.
Medications and kidney function
The kidneys clear many medications from the body. When kidney function is low, some doses need to be adjusted and some medicines are avoided. This can apply to certain antibiotics, pain relievers and diabetes medicines.
- Tell every prescriber, including urgent care and the dentist, that you have kidney disease and whether you are on dialysis.
- Ask before taking any over-the-counter pain reliever. Common anti-inflammatory pain relievers such as ibuprofen and naproxen can be hard on the kidneys.
- Do not stop or change a prescription on your own. Bring concerns to the prescriber, the pharmacist or a medication review.
What to tell each team
The wound care clinician
- Your stage of kidney disease, if you know it, or your dialysis days and times
- Your kidney doctor’s name and the dialysis center
- Any limits on fluids or diet
- Which arm has your dialysis access
The kidney team
- That you have a wound, where it is and who is treating it
- Any antibiotic or new medication ordered for it
- Changes in swelling, pain or drainage
What Gateway coordinates
Gateway arranges wound care and primary care follow-up with partner clinicians in Greater St. Louis and the Metro East. Tell us your dialysis days when you call, so scheduling can take them into account. With your permission, we share records and questions among the wound care clinician, your primary care physician, your kidney doctor and the dialysis center. Treating clinicians make all medical decisions.
We also help with lab and imaging coordination, and people with several long-term conditions can ask about chronic care management. Call 314-325-0126 or send a request for care with a name and phone number only.
Changes to report and when to call 911
Call the treating clinician’s office promptly about:
- Fever or chills, spreading redness, warmth, pus or a bad smell
- New skin patches that are very painful and purple, dark or black
- Swelling that rises quickly
- Any problem at the dialysis access site
Call 911 for trouble breathing, chest pain, fainting, sudden confusion, or bleeding from a dialysis access that does not stop with firm pressure. Gateway is not an emergency service.
Common questions
Does mild or early kidney disease affect wound healing?
The effects grow as kidney function falls. Early kidney disease may have little direct effect on a wound. The conditions that travel with it, such as diabetes, high blood pressure and poor circulation, often matter more at that stage. Ask how your kidney numbers fit in.
Can I drink protein shakes to help my wound if I have kidney disease?
Ask first. Protein needs differ by stage of kidney disease and change again on dialysis. Some shakes also contain a lot of potassium or phosphorus. A renal dietitian or your kidney clinician can tell you whether a shake makes sense and which kind fits your limits.
Why is my skin so itchy, and does scratching matter?
Itching is common with kidney disease. Dry skin and substances the kidneys no longer clear both play a part. Scratching can break the skin and start new sores, especially on swollen legs. Tell your kidney team, since treatments exist. Our guide on itching around a healing wound has comfort ideas to discuss.
Do I need to tell my kidney doctor about a small wound?
Yes. People with kidney disease are more prone to infection and tend to heal slowly, so a small wound deserves early attention. Your kidney doctor also needs to know about any antibiotic prescribed, because some doses depend on kidney function.
Related pages
General information to help you talk with your own clinician. It is not medical advice, and the treating clinician makes every clinical decision. For a medical emergency, call 911.
Updated October 2026