Diabetic Foot: Care, Warning Signs and Assessment

What does “diabetic foot” mean?

“Diabetic foot” is a general term for foot problems that can occur in people living with diabetes. It does not describe one single condition. Diabetes may affect nerves, blood vessels, skin and the way a person bears weight through the feet. A small injury can therefore be harder to notice, may be exposed to continued pressure, or may take longer to heal. Some people develop an ulcer, infection or change in foot shape; many people with diabetes do not.

A diabetic foot ulcer is an open sore or wound, often on the sole, toes or another area exposed to pressure or rubbing. An ulcer may begin with a blister, crack, cut, callus or shoe-related injury. If sensation is reduced, the person may not feel the injury. If circulation is also impaired, the body may have difficulty delivering the blood and oxygen needed for healing. Infection can make the situation more serious.

Foot problems in diabetes can involve more than circulation. Nerve damage, infection, pressure, changes in foot structure and other health conditions may all contribute. A vascular assessment can be important when reduced blood flow is suspected, but it does not replace diabetes care, wound assessment, infection management or specialist foot care when these are needed.

The purpose of this page is to explain common risks, everyday prevention and signs that should prompt medical advice. It is general information, not a way to diagnose an ulcer or decide on treatment at home. If a wound, colour change, new swelling or other concerning symptom develops, contact a qualified healthcare professional promptly.

How diabetes can affect the feet

Diabetes can contribute to foot problems through several pathways. The effects are not the same for everyone, and a person may have one or more factors at the same time. Understanding these pathways helps explain why regular foot checks and a personalised care plan are important even when the feet do not hurt.

Nerve changes and reduced sensation

Over time, diabetes may damage peripheral nerves. This is often called diabetic peripheral neuropathy. A person may experience tingling, burning, pain or numbness. Some people notice less sensation of touch, pressure, heat or cold. Others may have nerve changes without obvious symptoms. Reduced sensation can make it harder to notice a pebble in a shoe, a blister, a cut, a burn or pressure from footwear.

Pain normally serves as a warning that tissue may be injured. When sensation is reduced, a person may continue walking on an injured area without realising it. Repeated pressure can deepen a wound or prevent it from healing. That is one reason a visual inspection is useful even when the feet feel normal.

Reduced blood flow

Diabetes is associated with an increased risk of blood-vessel disease. Narrowed arteries can reduce blood flow to the legs and feet, a condition often called peripheral artery disease (PAD). Reduced circulation may affect the skin’s ability to heal and may make an existing wound more difficult to manage. A person may not have the same symptoms as someone else, so circulation concerns need clinical assessment.

Veins and arteries have different roles. Arteries carry blood from the heart toward the tissues; veins return blood toward the heart. A diabetic foot problem may involve arterial flow, nerve function, infection, pressure or several of these. A visible vein is not, by itself, a measure of how much arterial blood reaches the foot.

Skin, nails and foot shape

Nerve changes and circulation problems can occur alongside dry skin, thickened nails, calluses or changes in the shape of the toes and feet. A callus may form where pressure is repeated. Under some circumstances, a wound may develop beneath thickened skin and remain hidden. Foot-shape changes can also alter how weight is distributed when standing or walking.

A warm, swollen or red foot can have several causes. In some people with diabetes, a change in foot shape and warmth may require prompt assessment for a condition such as Charcot neuro-osteoarthropathy. Do not assume that a warm or swollen foot is simply a minor strain, especially if sensation is reduced.

Infection and delayed healing

An opening in the skin can allow bacteria to enter. A wound may become infected, and infection can spread into deeper tissues. Reduced sensation may mean that pain is mild or absent even when a problem is significant. Redness, warmth, swelling, discharge, an unpleasant smell or a change in the wound should be taken seriously and assessed by a healthcare professional.

These factors can interact: loss of sensation may allow an injury to go unnoticed; pressure may keep irritating the same area; reduced blood flow may affect healing; and infection may add further tissue damage. Early evaluation gives the care team a chance to identify these factors and determine the appropriate next steps.

Warning signs to look for

Check both feet, including the soles, heels, sides and spaces between the toes. Look at the skin and nails as well as the overall shape of the foot. A mirror can help you see the sole. If you cannot see or reach your feet comfortably, ask a trusted person or healthcare professional to help. Do not rely on pain alone as a signal that something is wrong.

Contact a healthcare professional promptly if you notice a new cut, blister, crack, open sore, drainage, redness, warmth, swelling, skin-colour change, a painful or infected-looking nail, or a callus with blood beneath it. A wound that is not healing or appears to be getting larger should not be managed only with home care. If you have reduced sensation, a wound may need assessment even if it is not painful.

A change in foot temperature or shape can also matter. A foot that becomes noticeably warmer, redder or more swollen than the other foot needs medical attention, particularly if you have neuropathy. New difficulty walking, a pressure area that keeps returning or a sudden change in how a shoe fits are useful details to share with your clinician.

Seek emergency care for a rapidly spreading infection, severe illness, fever with a concerning foot wound, black or discoloured tissue, confusion, fainting or another symptom that feels like an emergency. A clinician should determine whether urgent treatment is required. Do not wait for a routine appointment when the foot is deteriorating quickly.

If you have a known diabetes-related foot risk, follow the instructions from your own care team about when and how to contact them. Advice may differ depending on sensation, circulation, previous ulcers, foot shape and current treatment. This page cannot replace those individual instructions.

Who may have a higher risk of foot problems?

Anyone with diabetes can develop a foot problem, but some factors make regular professional checks especially important. These include reduced sensation, a previous foot ulcer or amputation, peripheral artery disease, a change in foot shape, recurring calluses, difficulty seeing or reaching the feet, and a wound or infection that has occurred before. The care team can use a foot examination to understand personal risk and agree on an appropriate follow-up plan.

A longer history of diabetes, blood glucose levels that are often above an individual’s target, smoking, high blood pressure, abnormal cholesterol and other health conditions may be relevant to overall risk. These factors do not mean that a person will necessarily develop an ulcer. They are reasons to discuss prevention and monitoring with the healthcare professionals managing the person’s diabetes and vascular health.

Previous foot problems are particularly important to mention. Tell your clinician if you have had an ulcer, a lower-limb procedure, a toe or foot operation, a serious infection or an amputation. Also mention any change in balance, walking, sensation or ability to care for your feet. These details may affect how often your feet should be checked and whether a podiatrist or another specialist should be involved.

Risk is not always obvious from appearance. A person may have a high-risk foot without a visible wound, while another person may have a minor skin problem that is straightforward to manage. A clinical assessment considers sensation, circulation, skin, nails, foot shape, footwear and medical history rather than relying on one sign.

What happens during a diabetic foot assessment?

A foot assessment may be part of routine diabetes care or may be arranged because a new symptom or wound has appeared. The clinician may ask about your diabetes history, previous foot problems, medicines, smoking, mobility, footwear and any changes you have noticed. They may ask whether you feel tingling, numbness, burning, pain or unusual temperature sensations.

The examination may include checking the skin, nails, pressure areas, calluses, wounds and foot shape. The clinician may assess sensation using simple examination tools, check pulses and compare the feet. They may also consider whether your footwear fits appropriately and whether pressure is concentrated in a particular area.

If a wound is present, the team may document its location, depth, appearance and surrounding skin. They may look for signs of infection and decide whether additional tests or referrals are needed. Do not try to estimate the depth of a wound by probing it or removing tissue at home. Assessment and wound care should be performed by appropriately trained professionals.

The care plan depends on the findings. Some people need preventive advice and routine follow-up. Others need specialist foot care, pressure relief, wound management, infection assessment, vascular testing or a combination of services. There is no single examination or treatment pathway that applies to every person with diabetes.

Tell the clinician if you have difficulty performing daily checks, applying dressings, cutting nails safely or getting to appointments. Practical barriers matter. A care plan is more useful when it accounts for mobility, vision, support at home, work, transport and the person’s ability to follow the recommendations.

Why circulation may need assessment

A wound may heal poorly for several reasons, and reduced arterial blood flow is one possibility. When a clinician suspects a circulation problem, they may examine the pulses and consider tests that assess blood flow to the lower leg and foot. The choice of test depends on the person’s symptoms, the examination and other health conditions.

Ankle pressure measurements, toe pressure measurements, Doppler ultrasound or other vascular imaging may be considered in selected cases. People with diabetes can have arterial calcification that affects interpretation of some measurements, so clinicians may use more than one type of information. The purpose of testing is to understand the circulation and help determine whether a vascular specialist should be involved.

A circulation test does not assess every cause of a foot wound. It does not replace examination for infection, neuropathy, pressure, bone involvement or other conditions. Similarly, an image of an artery should be interpreted with the clinical findings rather than considered on its own. A healthcare professional can explain what a test can and cannot show in your situation.

If a vascular problem is found, a specialist may discuss whether any vascular treatment is appropriate. The decision depends on the location and severity of the problem, the wound, the person’s overall health and the likely benefits and risks of available options. Vascular intervention is not needed for every diabetic foot wound and cannot replace wound care, pressure management, diabetes care or infection treatment.

The distinction between arteries and veins is important. Arterial disease can reduce the supply of blood to the foot. Venous conditions affect the return of blood toward the heart and can contribute to swelling or skin changes. Some people have more than one circulation problem, but a venous finding does not automatically explain a diabetic foot ulcer.

Daily foot care for people with diabetes

Daily care can help you notice a problem early, but it cannot prevent every complication. Ask your diabetes care team to tailor advice to your sensation, circulation, foot shape, previous injuries and current treatment. If you already have an ulcer, infection or a high-risk foot, follow the specific plan provided by your clinicians rather than treating it as routine self-care.

Check your feet every day

Look for cuts, blisters, cracks, red areas, swelling, fluid, bruises, calluses, skin colour changes and nail problems. Check the soles, heels and the areas between the toes. Use a mirror or ask someone to help if you cannot see all parts of your feet. Check inside your shoes for objects, rough seams or areas that could rub before putting them on.

If you find a new wound or change, make a note of when you noticed it and contact your healthcare professional for advice. A photograph may help you describe a change to your care team, but it is not a substitute for a clinical assessment. Do not wait for pain to develop if sensation is reduced.

Wash and dry carefully

Wash your feet gently with warm, not hot, water and mild soap. If you have reduced sensation, test the water with your hand or another safe method rather than relying on your feet to judge temperature. Dry carefully, especially between the toes. Avoid soaking your feet for a long time, as soaking can dry or soften the skin and may create additional problems for some people.

If your skin is dry, ask your care team about an appropriate moisturiser. Avoid applying cream between the toes unless a clinician has advised you to do so, because excess moisture in that area may encourage skin problems. Do not apply a product to an open wound without professional guidance.

Care for nails and calluses safely

Nail and callus care should be adapted to your sensation, eyesight, flexibility and circulation. If you have difficulty seeing or reaching your feet, thick or curved nails, reduced sensation, poor circulation or a history of ulcers, ask a podiatrist or qualified healthcare professional to advise you. Do not cut into the corners of a nail or try to remove a deep callus yourself.

Avoid sharp blades, corn plasters, acid-based corn removers or other products that can damage the skin unless your clinician specifically recommends them. A small cut may be difficult to notice when sensation is reduced. Tell your care team about a callus that repeatedly returns, contains blood or sits over a pressure point.

Protect your feet from heat and cold

Reduced sensation can make it harder to recognise burns or cold injury. Avoid placing a heating pad, hot-water bottle or other direct heat source against your feet. Test bath water before stepping in, and wear suitable footwear on hot pavement or at the beach. In cold weather, use warm socks and footwear that do not create pressure or restrict circulation.

Keep up with diabetes care

Follow the diabetes management plan agreed with your healthcare professional. This may include medicines, monitoring, nutrition, physical activity and regular appointments. Do not start, stop or change diabetes medication based on foot symptoms or information on this page. Contact your diabetes care team if you are unsure how a new wound or infection affects your existing plan.

Discuss smoking and activity

Smoking can affect blood vessels and overall health. If you smoke, ask your healthcare professional about support to stop. Physical activity may be beneficial for general health, but the right type and amount depend on your foot condition and mobility. If you have an active ulcer, a painful foot or a recent procedure, ask your care team what activities are safe and whether pressure on the foot should be reduced.

Footwear, pressure and injury prevention

Shoes that rub, press or do not fit properly can create blisters and wounds. This is especially important when sensation is reduced, because discomfort may not warn you that the shoe is causing damage. Choose footwear that fits the shape and length of your foot, has adequate internal space and does not create pressure points.

Put on shoes with socks or another suitable protective layer, and check the inside of each shoe before wearing it. Look for small objects, damaged lining, raised seams or rough areas. Replace footwear that has become worn or misshapen. If you notice a recurring red mark or blister, stop using the footwear that appears to cause it and ask a clinician for advice.

Avoid walking barefoot, including indoors, if your care team has advised you that your feet are at risk. Even a small object, hot surface or rough floor can cause an injury that goes unnoticed. Slippers should fit securely and protect the foot; loose footwear can increase the chance of slipping or rubbing.

Some people benefit from therapeutic or custom footwear, insoles or other ways to reduce pressure. These should be selected based on an assessment of the foot, walking pattern, pressure points and medical history. An insert that works for one person may not fit another person’s needs. Ask a podiatrist or relevant foot-care professional whether pressure-relieving footwear is appropriate.

Pressure relief, sometimes called offloading, may be an important part of ulcer care. The clinician may recommend a specialised device, footwear, dressing or other approach to reduce repeated force on the affected area. Do not improvise a device or alter a prescribed dressing without discussing it with the treating team.

What to do if a foot wound develops

A new wound on a person with diabetes should be taken seriously, even if it is small and does not hurt. Contact the healthcare professional or foot-care service responsible for your diabetes care and follow their instructions. They can advise how soon the wound needs to be seen and whether you need additional assessment.

Keep the wound protected according to the advice you receive. Avoid walking barefoot and avoid activities that place repeated pressure on the affected area until a clinician has advised you. Do not cut away tissue, squeeze a wound, probe its depth, use household chemicals or apply leftover medicines. These actions may damage tissue, mask signs of infection or delay appropriate treatment.

The clinical team may assess the wound, surrounding skin, sensation, pressure and blood flow. Depending on the findings, they may consider a dressing, pressure relief, infection assessment, imaging, laboratory tests or referral to another specialist. The appropriate plan depends on the wound and the patient; there is no universal dressing or home treatment that is suitable for every diabetic foot ulcer.

If the wound is spreading, has discharge or an unpleasant smell, becomes increasingly red or warm, or is accompanied by fever or feeling unwell, seek urgent medical advice. A person with neuropathy may not feel the degree of tissue damage, so visible change can be important even without severe pain.

Follow-up is part of wound care. A wound may need repeated professional review to check its progress and adjust pressure relief or treatment. Keep appointments and contact the care team if you cannot attend or if the wound changes before the next visit. Do not assume that a wound is healing simply because it is covered by a dressing.

How diabetic foot problems are treated

Treatment depends on what the assessment finds. A care plan may involve more than one professional and may address the wound, infection, pressure, sensation, circulation, diabetes management and footwear. The order and combination of care vary. The aim is to treat the identified problems and reduce the chance that further injury occurs.

Wound assessment and local care

A qualified clinician assesses the wound and surrounding tissue before deciding on local care. Dressings may be selected according to the wound’s condition and the clinical plan. Wound care may also include regular monitoring and, when appropriate, professional removal of non-viable tissue. The patient should receive clear instructions about dressing changes, bathing, activity and when to seek help.

Pressure relief

Repeated pressure can prevent a wound from healing. A podiatrist or foot-care team may recommend offloading or footwear changes to reduce pressure on the affected area. The device or method should be suited to the wound and the patient’s ability to walk safely. Pressure relief needs follow-up because the foot, dressing and device may change over time.

Infection evaluation and treatment

A clinician evaluates whether infection is present and how extensive it may be. If antibiotics or another treatment are needed, the choice and duration should be determined by the treating professional based on the clinical findings and relevant tests. Do not use leftover antibiotics or stop a prescribed course without speaking with the clinician who is managing the infection.

More serious infections may require urgent assessment, additional imaging, specialist care or hospital treatment. A wound’s appearance can change quickly. Contact the responsible service if redness, warmth, swelling, discharge, odour or general illness is developing or worsening.

Vascular assessment and treatment when indicated

If the care team suspects reduced arterial blood flow, a vascular specialist may be involved. The specialist can review circulation tests and discuss whether a vascular procedure is appropriate. Options depend on the anatomy, the location and severity of the arterial disease, the wound and the patient’s overall health. Vascular intervention is not required for every wound and cannot guarantee healing.

A vascular procedure, when recommended, is one part of a broader care plan. Wound management, pressure relief, infection care and diabetes management may still be needed. The patient should be told what the procedure is intended to address, what its possible benefits and risks are, what alternatives exist and how follow-up will be arranged.

Coordinated care

Depending on the situation, the care team may include a diabetes clinician, primary care doctor, podiatrist, wound-care professional, vascular specialist, infectious disease clinician, orthopaedic specialist or surgeon. Not every patient needs every specialist. Coordinating care helps ensure that a wound, infection, pressure problem and circulation concern are considered in the right context.

Ask who is coordinating your care and whom to contact if a new symptom appears. Keep a record of appointments, treatments and instructions. If two clinicians give advice that seems inconsistent, ask them to clarify how the recommendations fit together rather than changing treatment on your own.

When to seek urgent medical care

Contact a healthcare professional promptly for a new ulcer, blister or cut; a wound that is not healing; redness, warmth or swelling; drainage or a bad smell; a sudden change in foot colour or temperature; a new area of numbness; or a change in foot shape. Do not wait for the next routine diabetes appointment if these signs appear.

Seek emergency care if symptoms are severe or rapidly worsening, if tissue becomes black or markedly discoloured, if redness is spreading quickly, or if you develop fever, confusion, fainting, severe weakness or another sign of serious illness. Emergency assessment is also appropriate if a clinician has told you that a particular symptom requires immediate care.

A painless wound can still be serious when sensation is reduced. Likewise, a foot that is hot and swollen may need prompt evaluation even if there is little pain. If you are unsure how urgent a change is, contact your healthcare team or local emergency service for guidance rather than waiting to see whether it resolves.

Do not use this page to decide that an ulcer is infected, that circulation is adequate or that a treatment can safely wait. Those decisions require assessment by healthcare professionals who can examine the foot and arrange appropriate testing.

Building a practical long-term foot-care routine

A lasting foot-care routine should fit into everyday life. Many people find it helpful to check their feet at the same time each day, such as when taking off their shoes in the evening. Keep a mirror nearby or arrange for someone you trust to help if you cannot see the soles. Make sure you know how to contact your diabetes or foot-care team if you notice a change.

Bring foot concerns to regular diabetes appointments. Remove shoes and socks when appropriate so the clinician remembers to examine your feet. Ask how often you need a comprehensive foot check based on your risk. Some people may need more frequent monitoring than others, especially if they have reduced sensation, poor circulation, a previous ulcer or a change in foot shape.

If you find daily care difficult, tell your clinician. Vision, flexibility, pain, mobility, living arrangements and access to suitable footwear can all affect how easy it is to follow recommendations. Your care team may be able to suggest practical support or refer you to a professional who can help with nail care, pressure management or footwear.

Foot care is connected with overall diabetes care. Keep appointments, take prescribed medicines as directed and ask your clinician how blood glucose, blood pressure, cholesterol, smoking and activity relate to your individual health plan. The right advice depends on your health and should come from the professionals who know your medical history.

Prevention does not mean that every foot problem can be avoided. If an ulcer or another complication occurs, it is not a reason to blame yourself. The important next step is to contact a qualified professional, follow the assessment plan and ask for help with any part of care that is difficult to manage.