Foot ulcers are largely preventable with consistent daily habits, proper footwear, and good blood sugar management. Most foot ulcers develop in people with diabetes, where a combination of nerve damage, poor circulation, and minor injuries creates a perfect storm for wounds that heal slowly or not at all. The good news: each of these risk factors can be managed before an ulcer ever forms.
Why Foot Ulcers Develop
Three things typically work together to cause a foot ulcer. The first is nerve damage (neuropathy). Chronically high blood sugar triggers chemical changes in nerve cells that gradually reduce sensation in the feet. Over time, you lose the ability to feel pain from a blister, a pebble in your shoe, or a cut on your sole. Without that pain signal, injuries go unnoticed and worsen.
The second factor is poor blood flow. Diabetes increases the risk of peripheral artery disease, which narrows the blood vessels in the legs and feet. Reduced circulation means less oxygen and fewer immune cells reach the tissue, so even small wounds heal slowly and are more prone to infection. When neuropathy and poor circulation overlap, the risk climbs sharply.
The third is mechanical stress. Nerve damage also affects the muscles in the foot, leading to subtle changes in foot shape. Toes can curl or the arch can shift, creating pressure points on the sole that wouldn’t exist otherwise. Repeated pressure on those spots, especially in ill-fitting shoes, eventually breaks the skin down. Autonomic nerve damage also reduces sweating, leaving the skin dry, cracked, and vulnerable to breaks that serve as entry points for bacteria.
Keep Blood Sugar in a Protective Range
Blood sugar control is the single most important factor in preventing the nerve and blood vessel damage that leads to ulcers. Research shows that ulcer risk rises steeply once HbA1c (a measure of average blood sugar over three months) climbs above 7%. Below that threshold, lowering it further doesn’t appear to reduce ulcer risk any more, which means 7% is a practical target to aim for. If your HbA1c is consistently above 7%, working with your care team to bring it down is one of the highest-impact steps you can take to protect your feet.
Inspect Your Feet Every Day
A daily foot check takes less than two minutes and catches problems before they become serious. Because neuropathy can make injuries painless, your eyes have to do the work your nerves no longer can. Look at the tops, bottoms, sides, and between each toe. If you can’t easily see the bottom of your foot, use a mirror on the floor or ask someone to help.
You’re looking for:
- Color changes: red spots (pressure or irritation), white or blue patches (poor circulation), or darkened areas
- Skin breaks: cuts, cracks, blisters, or any opening in the skin, no matter how small
- Moisture between toes: soggy, white skin in the web spaces can signal a fungal infection that weakens the skin barrier
- Calluses or corns: thickened skin indicates repeated pressure and can break down into an ulcer underneath
- Swelling or warmth: one foot that feels warmer or looks puffier than the other may be inflamed
- Nail changes: thickened, discolored, or ingrown toenails that could lead to infection
Monitor Skin Temperature
Inflammation generates heat before visible damage appears on the skin surface. A simple at-home technique involves using a handheld infrared thermometer to measure temperature at several spots on each foot daily. If the same spot on one foot is more than 2.2°C (about 4°F) warmer than the matching spot on the other foot for two days in a row, that’s a warning sign. The recommended response is to reduce walking and stay off your feet until the temperature difference resolves. Multiple clinical trials have shown this approach catches trouble early and reduces ulcer rates.
Choose the Right Footwear
Shoes are either your best protection or your biggest risk factor, depending on how well they fit. For people at high risk, therapeutic footwear with specific features makes a measurable difference in reducing the pressure points that cause ulcers.
The most important features to look for:
- Deep, wide toe box: your toes should move freely without rubbing against the top or sides of the shoe. An extra 1 to 1.5 cm of depth above the toes is the recommended range. A rounded or square toe box works better than a pointed one, especially if your toes are curled or your foot shape has changed.
- Rocker sole: a rigid, curved sole that rolls the foot forward during walking, reducing pressure under the ball of the foot. The best designs place the rocker’s pivot point just behind the toe joints.
- Custom insoles: cushioning that is matched to your individual foot pressure profile reduces peak pressure significantly more than generic insoles made from the same material. If you’ve had a previous ulcer or have areas of high pressure, custom-molded inserts are worth pursuing.
Never walk barefoot, even indoors. A thumbtack, a sharp toy, or a hot floor can cause an injury you won’t feel. Wear well-fitting socks without seams that could rub, and check inside your shoes before putting them on. Run your hand along the inside to feel for pebbles, bunched-up lining, or rough spots.
Care for Your Skin and Nails Safely
Dry, cracked skin is an open invitation for bacteria. After washing your feet in lukewarm water (test it with your elbow or a thermometer, not your feet, since you may not feel extreme temperatures), dry thoroughly between the toes and apply a plain moisturizer to the tops and bottoms. Skip the spaces between toes, where trapped moisture encourages fungal growth.
Toenail care matters more than most people realize. Trim nails straight across, leaving them slightly longer at the corners so sharp edges don’t dig into the surrounding skin. Keep them no longer than the tip of the toe. Never cut your cuticles, since even a tiny nick can become infected. If you have thick calluses, do not try to shave or cut them off yourself. That kind of “bathroom surgery” is one of the most common triggers for ulcers in people with neuropathy. A podiatrist can remove calluses safely and evaluate whether your foot mechanics are causing them to return.
Improve Circulation
Regular physical activity helps blood flow reach the feet. Walking, swimming, and cycling are good options, though you should check your feet afterward for any new redness or irritation. Avoid sitting with your legs crossed for long periods, which compresses blood vessels. When resting, elevating your feet slightly can help reduce swelling. Smoking dramatically accelerates artery disease and should be eliminated entirely if foot health is a priority.
Preventing Recurrence After a First Ulcer
If you’ve already had a foot ulcer, prevention becomes even more critical. Recurrence rates are roughly 34% within the first year, 61% by year three, and 70% by year five. Those numbers reflect how persistent the underlying conditions are: the nerve damage and circulation problems that caused the first ulcer don’t go away when the wound heals. The healed spot is also structurally weaker and more prone to breaking down again.
After a healed ulcer, the daily inspection and temperature monitoring habits described above become non-negotiable. Your footwear needs may change as well, since scar tissue alters pressure distribution. Regular podiatric visits (typically every one to three months for high-risk feet) allow a professional to catch subtle changes you might miss and to manage calluses before they become dangerous. The combination of consistent self-care and professional monitoring is what keeps recurrence rates at the lower end of that range rather than the higher.
Warning Signs That Need Prompt Attention
Even with careful prevention, problems can develop. Watch for redness, increased warmth, or swelling around any wound or pressure area. Drainage that increases in amount or turns cloudy, any unusual odor from the foot, fever or chills, increasing pain, or firmness around a wound all suggest infection is setting in. A foot that appears very white, blue, or black indicates a serious circulation problem. Any of these signs warrant same-day medical evaluation, because diabetic foot infections can escalate within hours from a minor concern to a limb-threatening emergency.