When most people think of kidney disease, they picture blood tests, dialysis machines and dietary restrictions. The feet rarely come to mind. Yet the feet are among the places where chronic kidney disease (CKD) does some of its quietest and most damaging work. Far from the kidneys, the feet depend on healthy nerves, good circulation, intact skin and a competent immune response, and kidney failure compromises all four. For people living with renal disease, foot care is not a cosmetic concern but a central part of preventing infection, amputation and loss of independence.
Why the feet are vulnerable
The kidneys filter waste, balance fluids and electrolytes, regulate blood pressure and help maintain healthy bones and red blood cells. As kidney function declines, waste products accumulate and these systems fall out of balance. The feet, being the body’s most distant and weight-bearing structures, tend to show the consequences early.
One major problem is peripheral neuropathy. Toxins that build up in advanced kidney disease can damage the long nerves that supply the legs and feet, producing numbness, tingling, burning or reduced sensation. Diabetes, the leading cause of kidney failure in many countries, adds its own nerve damage, so many patients face a double burden. A person who cannot feel a pebble in a shoe, a blister forming or a cut on the sole may walk on the injury for days. What would be a trivial wound in someone with normal sensation can become a deep ulcer.
A second problem is poor circulation. Chronic kidney disease accelerates atherosclerosis, the hardening and narrowing of arteries, and is strongly associated with peripheral arterial disease. Reduced blood flow means that tissue receives less oxygen and fewer immune cells and nutrients, so even small wounds heal slowly or not at all. In severe cases, tissue dies, and amputation may be required. People on dialysis have notably higher rates of lower-limb amputation than the general population.
Skin, nails and swelling
Renal disease also changes the skin itself. Many patients develop xerosis, or severe dry skin, because of reduced sweating and altered skin hydration. Dry heels crack into fissures that act as entry points for bacteria and fungi. Persistent itching, known as uremic pruritus, is common in advanced disease; scratching can break the skin and introduce infection. Nails may become thickened, brittle or discoloured, and fungal infections of the skin and nails are more frequent, particularly in people whose immune systems are weakened by uremia or by immunosuppressive drugs taken after a kidney transplant.
Fluid retention is another hallmark of kidney disease. Edema, or swelling of the feet and ankles, stretches the skin, making it fragile and prone to breakdown and weeping. Swollen feet also fit poorly in ordinary shoes, increasing friction, pressure and the risk of blisters. Edema can slow wound healing further by impairing the delivery of oxygen to tissues.
Less commonly, advanced kidney disease can cause serious skin conditions such as calciphylaxis, in which calcium deposits block small blood vessels and cause painful, non-healing skin lesions. Disturbances in calcium, phosphate and parathyroid hormone, known as mineral and bone disorder, can also weaken bones in the feet and, in combination with neuropathy, contribute to Charcot foot, a condition in which the bones and joints gradually collapse and the foot becomes deformed.
Practical principles of foot care
Because the risks are so interconnected, good foot care for people with renal disease rests on prevention, vigilance and early professional help.
Daily inspection is the cornerstone. Patients should look at the tops, soles, heels and between the toes every day, using a mirror or the help of a family member if flexibility or eyesight is limited. Redness, blisters, cuts, cracks, swelling, changes in colour or warmth should be noted and reported promptly. Because pain may be absent, visual checks substitute for the warning sign that sensation would normally provide.
Gentle hygiene and moisturising protect the skin barrier. Feet should be washed daily in lukewarm water, with water temperature checked by hand or elbow rather than by the feet, since neuropathy can mask scalding. Feet should be dried thoroughly, especially between the toes, where moisture encourages fungal growth. A fragrance-free moisturiser applied to the tops and soles, but not between the toes, helps prevent cracking. Long soaks should be avoided because they soften and weaken the skin.
Appropriate footwear is essential. Shoes should fit well, with room for the toes and without seams or rough areas that rub. Because swelling can change from morning to evening, many podiatrists suggest buying shoes later in the day. Seamless socks that are not tight at the top reduce pressure, and going barefoot, even at home, exposes feet to injury. Patients with deformities or established loss of sensation may need custom orthotics or therapeutic shoes.
Careful nail and callus care matters as well. Nails should be trimmed straight across and not too short, and those who cannot see or reach their feet well, or who have thick or fungal nails, should have a podiatrist do it. Corns and calluses should never be cut or treated with medicated pads or chemical removers, which can burn fragile skin. Heating pads, hot water bottles and hot footbaths should also be avoided.
Circulation and swelling can be supported by elevating the legs when resting, staying active within the limits set by the care team, and not smoking. Compression stockings can help edema but may be unsafe where arterial disease is present, so they should only be used on professional advice.
The role of the care team
No patient should manage these risks alone. Regular examinations by a podiatrist or other foot-care specialist, ideally at least annually and more often for those at higher risk, allow early detection of loss of sensation, poor pulses, deformities and skin problems. Nephrologists, dialysis nurses, diabetes educators and general practitioners all have a part to play, and patients should be encouraged to take off their shoes and socks at appointments so that feet are actually examined. Any wound that does not begin to improve within a few days, or that shows spreading redness, drainage, odour or fever, warrants urgent medical attention rather than home treatment.
Renal disease reaches into the feet through damaged nerves, narrowed arteries, fragile skin, swelling and weakened immunity. The result is a foot that cannot warn its owner of danger and cannot easily heal when injured. Fortunately, much of the resulting harm is preventable. Daily inspection, gentle skin care, well-fitting shoes, avoidance of self-treatment and regular professional review can turn a high-risk situation into a manageable one. For people with kidney disease, caring for the feet is a small daily habit with a very large payoff: preserving mobility, independence and quality of life.