Diabetic foot disease can lead to ulcers, infection, osteomyelitis and amputation. Learn how to recognize risk factors, screen for neuropathy and PAD, prevent foot ulcers, and manage diabetic foot complications according to current 2026 recommendations.

Diabetic foot disease is one of the most serious complications of diabetes mellitus. It includes peripheral neuropathy, peripheral artery disease (PAD), foot deformity, pre-ulcerative lesions, diabetic foot ulcers, infection, Charcot neuroarthropathy, gangrene, and osteomyelitis.

Diabetic foot complications can progress rapidly and may result in hospitalization, amputation, disability, and increased mortality. However, many complications are preventable through regular foot examination, appropriate footwear, early recognition of ulcers and infection, pressure offloading, vascular assessment, and multidisciplinary management.

Current recommendations are based primarily on the American Diabetes Association (ADA) Standards of Care in Diabetes—2026 and the International Working Group on the Diabetic Foot (IWGDF) 2023 guidelines, including IWGDF/IDSA guidance for diabetic foot infection.

What Is a Diabetic Foot Ulcer?

A diabetic foot ulcer is a break in the skin involving the epidermis and at least part of the dermis, occurring below the ankle in a person with diabetes.

Diabetic foot ulcers usually develop through a combination of:

Loss of protective sensation from diabetic peripheral neuropathy
Repetitive mechanical pressure or minor trauma
Foot deformity
Peripheral artery disease
Callus formation
Poor wound healing
Infection

The combination of neuropathy, deformity, and repetitive pressure is particularly important because patients may continue walking on an injured area without recognizing the damage.

Why Does Diabetes Cause Foot Problems?

Several mechanisms contribute to diabetic foot disease.

1. Peripheral neuropathy

Diabetic peripheral neuropathy can cause:

Numbness
Burning
Tingling
Loss of pain sensation
Loss of temperature sensation
Loss of vibration sensation
Weakness or muscle imbalance

Importantly, peripheral neuropathy may be asymptomatic. The ADA notes that up to approximately 50% of diabetic peripheral neuropathy may be asymptomatic.

Loss of protective sensation allows repetitive trauma to continue unnoticed.

2. Peripheral artery disease

PAD reduces blood flow to the foot and can impair:

Oxygen delivery
Tissue repair
Immune response
Wound healing

PAD may coexist with neuropathy, and ischemic diabetic foot disease may have surprisingly few symptoms.

3. Foot deformity

Examples include:

Hallux valgus
Hammertoes
Prominent metatarsal heads
Charcot foot
Limited joint mobility

These abnormalities increase plantar pressure and predispose to ulceration.

4. Hyperglycemia and impaired host defense

Poor glycemic control is associated with increased susceptibility to infection and impaired wound healing.

However, management of a diabetic foot ulcer should never focus on glucose alone. Pressure, infection, perfusion, wound care, and mechanical factors must also be addressed.

Who Is at High Risk?

Important risk factors include:

Loss of protective sensation
PAD
Previous foot ulcer
Previous amputation
Foot deformity
Callus or pre-ulcerative lesions
Charcot neuroarthropathy
Chronic kidney disease, particularly kidney failure
Smoking
Diabetic retinopathy
Poor glycemic control
Inadequate footwear
Limited access to healthcare
Difficulty performing daily foot inspection

The ADA 2026 risk stratification, adapted from IWGDF, can be summarized as follows:

Risk category	Main findings	Suggested examination frequency
0 – Very low	No LOPS and no PAD	At least annually
1 – Low	LOPS or PAD	Every 6–12 months
2 – Moderate	LOPS + PAD, LOPS + deformity, or PAD + deformity	Every 3–6 months
3 – High	LOPS or PAD plus previous ulcer, amputation, or kidney failure	Every 1–3 months

LOPS = loss of protective sensation.

Patients with previous ulceration, amputation, Charcot foot, PAD, or kidney failure should receive particularly close surveillance.

Diabetic Foot Screening

When Should the Feet Be Examined?

The ADA 2026 recommends:

A comprehensive foot examination at least annually for all people with diabetes
More frequent assessment for people at increased risk
Inspection at every visit for patients with sensory loss or previous ulceration/amputation

For type 2 diabetes, assessment for diabetic peripheral neuropathy should begin at diagnosis.

For type 1 diabetes, assessment should begin approximately 5 years after diagnosis and then at least annually.

What Should a Comprehensive Foot Examination Include?

1. Skin examination

Look for:

Ulcers
Blisters
Calluses
Corns
Fissures
Maceration
Fungal infection
Ingrown toenails
Redness
Swelling
Discoloration
Gangrene
Areas of pressure or friction

Examine the plantar surface and the spaces between the toes.

2. Neurological examination

Assessment should include:

10-g monofilament

The 10-g monofilament is an important test for loss of protective sensation.

It should not be used alone.

The ADA recommends combining monofilament testing with at least one additional neurological assessment, such as:

Vibration using a 128-Hz tuning fork
Pinprick sensation
Temperature sensation

3. Vascular examination

Assess:

Dorsalis pedis pulse
Posterior tibial pulse
Capillary refill
Skin temperature
Color changes
Dependent rubor
Pallor on elevation
Claudication
Rest pain

If PAD is suspected, additional vascular testing should be considered.

Peripheral Artery Disease Assessment

The presence of diabetes does not mean that poor wound healing should automatically be attributed to “diabetic microangiopathy.”

PAD should be actively assessed.

Depending on the clinical situation, evaluation may include:

Ankle-brachial index (ABI)
Toe pressure
Toe-brachial index
Pedal Doppler waveforms
TcPO₂
Skin perfusion pressure
Duplex ultrasound
CT angiography or MR angiography when appropriate

In patients with a diabetic foot ulcer and significant ischemia, early vascular specialist involvement is important.

The IWGDF PAD guideline considers findings such as ABI <0.4, ankle pressure <50 mmHg, toe pressure <30 mmHg, or TcPO₂ <30 mmHg to indicate severe ischemia requiring urgent vascular assessment.

How Should a Diabetic Foot Ulcer Be Evaluated?

When an ulcer is identified, document:

Location
Length × width × depth
Wound bed
Necrotic tissue
Slough
Exudate
Odor
Surrounding erythema
Callus
Exposed tendon
Exposed bone
Probe-to-bone result
Signs of ischemia
Signs of infection
Foot deformity

Photographic documentation can be useful for monitoring progress.

The ulcer should be classified using an appropriate validated classification system rather than simply describing it as “mild” or “severe.”

The Three Major Questions in Every Diabetic Foot Ulcer

A practical approach is to ask:

1. Is it infected?

2. Is it ischemic?

3. Is it being mechanically overloaded?

These three questions often determine the immediate management strategy.

Diabetic Foot Infection

A diabetic foot ulcer is not automatically infected.

Infection should be diagnosed clinically based on local or systemic signs of inflammation.

Possible findings include:

Increasing erythema
Warmth
Swelling
Tenderness or pain
Purulent discharge
Wound deterioration
Necrosis
Systemic manifestations in severe infection

The IWGDF/IDSA guideline recommends classifying infection severity using the IWGDF/IDSA classification system.

Do All Diabetic Foot Ulcers Need Antibiotics?

No.

This is an important principle.

A clinically uninfected diabetic foot ulcer should not receive antibiotics simply to prevent infection or accelerate healing.

Antibiotics should be used when there is clinical evidence of infection.

The IWGDF/IDSA guideline specifically recommends against antibiotic treatment of clinically uninfected ulcers.

How Long Should Antibiotics Be Given?

For most diabetic foot soft-tissue infections:

1–2 weeks is generally recommended.

Treatment may be extended, sometimes to approximately 3–4 weeks, when infection is extensive, improving slowly, or severe PAD is present.

If infection has not resolved after approximately 4 weeks of appropriate therapy, the diagnosis and treatment strategy should be reassessed.

Antibiotic selection should consider:

Severity of infection
Likely pathogens
Previous cultures
Previous antibiotic exposure
Local resistance patterns
Renal function
Drug interactions
Allergy history
Cost and availability

What About Pseudomonas?

Routine empirical coverage of Pseudomonas aeruginosa is generally not recommended in temperate settings.

However, the IWGDF/IDSA guideline suggests considering empirical Pseudomonas coverage in appropriate moderate or severe infections in patients residing in regions such as Asia when Pseudomonas has recently been isolated from the affected site.

Therefore, antibiotic selection should be individualized rather than automatically using broad-spectrum therapy.

Diagnosing Osteomyelitis

Osteomyelitis should be considered when there is:

Deep or chronic ulcer
Exposed bone
Positive probe-to-bone test
Persistent wound despite appropriate treatment
Recurrent ulcer over a bony prominence
Suspicious radiographic findings

A practical initial approach includes:

Probe-to-bone test
Plain X-ray
ESR, CRP, and/or PCT when appropriate

If uncertainty remains, MRI is recommended as the preferred advanced imaging test.

When osteomyelitis is strongly suspected and microbiological confirmation is required, bone rather than soft-tissue sampling is preferred for culture.

Antibiotic Duration for Osteomyelitis

The IWGDF/IDSA guideline recommends considering:

Up to 3 weeks after minor amputation when bone-margin culture is positive
Approximately 6 weeks for diabetic foot osteomyelitis treated without bone resection or amputation

Treatment must be individualized according to surgical management, clinical response, microbiology, and patient factors.

Wound Care

Effective diabetic foot ulcer management begins with standard wound care.

This generally includes:

Appropriate wound cleansing
Sharp debridement when indicated
Moist wound-healing environment
Appropriate dressings
Infection management
Pressure offloading
Vascular assessment
Optimization of metabolic and nutritional factors

Sharp debridement is an important component of standard care.

The IWGDF wound-healing guideline does not recommend routinely replacing standard sharp debridement with alternative approaches such as enzymatic, ultrasonic, chemical, biosurgical, or laser debridement.

Offloading: One of the Most Important Treatments

A plantar diabetic foot ulcer will often fail to heal if the patient continues to repeatedly load the ulcer.

Offloading is therefore a cornerstone of treatment.

For a neuropathic plantar forefoot or midfoot ulcer, the IWGDF recommends a non-removable knee-high offloading device as first choice, when appropriate and not contraindicated.

If this is not tolerated or contraindicated, a removable knee-high or ankle-high device may be considered.

When specialized devices are unavailable, appropriately fitted footwear combined with felted foam may be used as a lower-level alternative.

Simply telling a patient to “walk less” is often insufficient.

The mechanical load must be actively reduced.

When Should Revascularization Be Considered?

Consider vascular intervention when a diabetic foot ulcer is accompanied by clinically significant ischemia.

Urgent vascular assessment is particularly important when there is:

Severe ischemia
Gangrene
Infection plus PAD
Absent pulses
Very low toe pressure
Very low ankle pressure
Monophasic or absent pedal Doppler signals
Failure of the wound to improve

The IWGDF PAD guideline recommends reassessing vascular status when a wound fails to significantly improve—for example, when there is less than approximately 50% reduction in wound area after 4 weeks despite appropriate wound care, infection control, glucose management, and offloading.

Charcot Neuroarthropathy

A patient with diabetes and neuropathy who develops a:

Warm
Red
Swollen

foot should raise suspicion for active Charcot neuroarthropathy, even if there is no ulcer and even when the patient does not report significant pain.

This condition is frequently missed because neuropathy can reduce pain perception.

Plain X-rays should be obtained, and urgent specialist assessment is appropriate.

Early immobilization and offloading are critical to reduce the risk of progressive deformity, instability, ulceration, and amputation.

Advanced Wound-Healing Therapies

Most diabetic foot ulcers should first receive optimized standard care.

Advanced therapies should not substitute for:

Debridement
Offloading
Infection control
Vascular assessment
Appropriate dressings
Management of underlying disease

For chronic ulcers that fail to heal despite optimized standard care, selected adjunctive therapies may be considered.

The ADA 2026 notes that evidence-supported advanced therapies may include approaches such as:

Negative-pressure wound therapy in selected ulcer settings
Certain skin substitutes
Topical oxygen therapy

These should be considered selectively rather than routinely for every ulcer.

The IWGDF wound-healing guideline also emphasizes that advanced interventions should be adjuncts to best standard care, not replacements for it.

What Treatments Should Not Be Used Routinely?

Evidence-based diabetic foot care is also about avoiding ineffective or potentially harmful treatments.

Routine use of the following is not recommended simply to promote healing:

Antibiotics for clinically uninfected ulcers
Topical antiseptics
Honey
Routine topical antimicrobial dressings
Topical antibiotics for uninfected ulcers
Unproven herbal wound products
Various “miracle” wound-healing products

The IWGDF/IDSA guideline also recommends against several adjunctive treatments for diabetic foot infection, including topical antiseptics, silver preparations, honey, and topical antibiotics as routine infection therapy.

Daily Foot Care for People With Diabetes

Patients should be educated to:

Inspect the feet every day

Look for:

Blisters
Cuts
Redness
Swelling
Cracks
Calluses
Discoloration
Drainage
New wounds

Use a mirror or ask a family member for help if the soles cannot be seen.

Keep feet clean and dry

Wash regularly and dry carefully, especially between the toes.

Moisturize dry skin

Apply moisturizer to dry skin, but generally avoid applying it between the toes because excessive moisture can promote maceration.

Do not walk barefoot

This is especially important in patients with loss of protective sensation.

Choose appropriate footwear

Shoes should:

Fit properly
Provide adequate toe room
Avoid pressure points
Not cause rubbing
Be appropriate for foot deformity

High-risk patients may require therapeutic footwear.

Do not self-treat calluses or ingrown nails

Patients with neuropathy should avoid cutting calluses or attempting aggressive treatment of ingrown nails themselves.

Professional foot care is safer.

When Is a Diabetic Foot an Emergency?

Urgent medical assessment is required for:

Rapidly spreading redness
Significant swelling
Purulent discharge
Fever or systemic illness
Necrosis or gangrene
Severe ischemic pain
Black discoloration
Suspected deep abscess
Suspected necrotizing infection
Exposed bone
Suspected osteomyelitis
Severe PAD
A hot, red, swollen foot suspicious for Charcot neuroarthropathy

Severe diabetic foot infection or moderate infection with important comorbidities may require hospitalization.

Urgent surgical consultation is recommended for severe infection and for moderate infection complicated by gangrene, necrotizing infection, deep abscess, compartment syndrome, or severe ischemia.

Multidisciplinary Diabetic Foot Care

Optimal management frequently requires collaboration between:

Diabetes/medical specialists
Podiatrists or foot-care specialists
Wound-care clinicians
Vascular surgeons
Orthopedic or foot surgeons
Infectious disease specialists
Radiologists
Orthotists/prosthetists
Diabetes educators
Nurses
Nutrition professionals

A multidisciplinary approach is particularly important for:

Foot ulcers
PAD
Previous amputation
Charcot foot
Recurrent ulcers
Kidney failure
Severe infection

The ADA 2026 recommends an interprofessional approach for patients with foot ulcers and high-risk feet.

Practical Clinical Algorithm

Step 1 — Identify the problem

Is there:

Neuropathy?
PAD?
Deformity?
Callus?
Ulcer?
Infection?
Gangrene?
Charcot foot?

Step 2 — Assess perfusion

Check:

Pedal pulses
ABI when appropriate
Toe pressure/TBI
Doppler waveforms
Additional vascular imaging when indicated

Step 3 — Assess infection

Determine:

No infection
Mild infection
Moderate infection
Severe infection

Step 4 — Assess depth

Determine whether there is involvement of:

Skin
Subcutaneous tissue
Tendon
Joint
Bone

Step 5 — Offload

For plantar neuropathic ulcers, use an appropriate offloading device, with a non-removable knee-high device preferred when appropriate.

Step 6 — Debride and dress

Remove nonviable tissue when indicated and provide appropriate wound dressings.

Step 7 — Treat infection when present

Use culture-directed or appropriately selected empirical antibiotics according to severity and local resistance patterns.

Step 8 — Address ischemia

If PAD is significant, obtain vascular assessment and consider revascularization when appropriate.

Step 9 — Monitor healing

Document wound size and clinical progress.

If the wound fails to improve adequately, reassess:

Offloading
Infection
Perfusion
Glycemic management
Pressure
Osteomyelitis
Diagnosis

Key Take-Home Messages

Every person with diabetes should have a comprehensive foot examination at least annually.
Loss of protective sensation is a major risk factor for diabetic foot ulceration.
Use 10-g monofilament testing together with another neurological test.
Always assess vascular status when a diabetic foot ulcer is present.
A diabetic foot ulcer is not automatically infected.
Do not prescribe antibiotics for a clinically uninfected ulcer.
Offloading is one of the most important interventions for plantar diabetic foot ulcers.
Consider osteomyelitis when ulcers are deep, chronic, recurrent, or associated with exposed bone/positive probe-to-bone testing.
MRI is the preferred advanced imaging test when osteomyelitis remains uncertain after initial evaluation.
Severe infection, gangrene, deep abscess, necrotizing infection, compartment syndrome, or severe ischemia requires urgent specialist management.
A warm, red, swollen foot in a patient with neuropathy should raise suspicion for Charcot neuroarthropathy.
Prevention, early detection, pressure reduction, vascular assessment, and multidisciplinary care can reduce the risk of amputation.

Frequently Asked Questions (FAQ)

1. How often should a diabetic patient have their feet examined?

At least once every year if they have no significant risk factors.

Patients with neuropathy, PAD, deformity, previous ulceration, amputation, or kidney failure require more frequent examinations, ranging from every 1–12 months depending on risk category.

2. Can a diabetic foot ulcer heal without antibiotics?

Yes.

If the ulcer is not clinically infected, antibiotics are not indicated.

Healing depends on appropriate wound care, offloading, perfusion, pressure reduction, and management of underlying disease.

3. Should every diabetic foot ulcer receive an X-ray?

Not necessarily.

Plain radiographs are useful when there is concern about:

Osteomyelitis
Foreign body
Gas
Fracture
Charcot neuroarthropathy
Significant structural abnormality

Further imaging, particularly MRI, may be necessary when osteomyelitis remains uncertain.

4. What is the best test for diabetic neuropathy?

No single test identifies every aspect of diabetic neuropathy.

The 10-g monofilament is particularly useful for identifying loss of protective sensation and should be combined with another neurological assessment such as vibration, pinprick, or temperature testing.

5. What is the best offloading treatment for a plantar diabetic foot ulcer?

For an uncomplicated neuropathic plantar forefoot or midfoot ulcer, a non-removable knee-high offloading device is recommended as the first-choice intervention when appropriate.

A removable device is an alternative when the first-choice approach is contraindicated or not tolerated.

6. Does good glucose control heal diabetic foot ulcers?

Good glycemic management is important, but it is not sufficient by itself.

A nonhealing ulcer may be caused by:

Continued pressure
PAD
Infection
Osteomyelitis
Poor wound care
Foot deformity

All of these factors must be addressed.

7. When should a diabetic foot ulcer be referred to a vascular specialist?

Referral should be considered when there are signs of PAD, ischemia, gangrene, poor wound healing, absent pulses, or severe ischemia.

Urgent vascular consultation is particularly important when PAD is associated with infection or gangrene.

8. What does a positive probe-to-bone test mean?

A positive probe-to-bone test increases suspicion for osteomyelitis, particularly in a deep or chronic ulcer.

However, it should not be interpreted in isolation. Clinical assessment, X-ray, inflammatory markers, and sometimes MRI or bone culture may be required.

9. Is a red, hot and swollen diabetic foot always an infection?

No.

A warm, red, swollen foot in a person with diabetic neuropathy may represent active Charcot neuroarthropathy, especially when there is no clear wound or infection.

This is a clinical situation requiring urgent assessment.

10. Can a diabetic patient walk barefoot at home?

It is generally discouraged, particularly in people with neuropathy or loss of protective sensation.

A person may step on a sharp object, develop a blister, or sustain thermal injury without feeling it.

11. Can patients cut their own calluses?

Patients with neuropathy should generally not use blades, corn cutters, acids, or aggressive home treatments for calluses.

Professional foot-care assessment is safer.

12. When is hospitalization necessary?

Hospitalization should be considered for severe diabetic foot infection and for selected moderate infections associated with important comorbidities or complications.

Sepsis, extensive infection, gangrene, necrotizing infection, deep abscess, severe ischemia, or major metabolic instability are particularly concerning.

Conclusion

Diabetic foot disease is a preventable and treatable complication of diabetes, but successful outcomes depend on early recognition and coordinated management.

The most important principles are straightforward:

Screen regularly → identify neuropathy and PAD → inspect the foot → recognize infection early → offload pressure → debride appropriately → assess perfusion → treat infection when present → monitor healing closely.

Patients with previous ulcers, amputations, PAD, Charcot neuroarthropathy, neuropathy, or kidney failure require particularly intensive prevention and lifelong surveillance.

Early specialist involvement can make the difference between healing a foot ulcer and progressing to infection, hospitalization, or amputation.

References

American Diabetes Association Professional Practice Committee. 12. Retinopathy, Neuropathy, and Foot Care: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1):S261–S276.
International Working Group on the Diabetic Foot (IWGDF). IWGDF Guidelines on the Prevention and Management of Diabetes-Related Foot Disease. 2023 Update. The IWGDF 2023 guideline set remains the latest published comprehensive IWGDF update; the next update is planned for 2027.
Bus SA, et al. IWGDF Guidelines on the prevention of foot ulcers in persons with diabetes. 2023 update. IWGDF.
Bus SA, et al. IWGDF Guidelines on offloading foot ulcers in persons with diabetes. 2023 update. IWGDF.
Senneville É, et al. IWGDF/IDSA Guidelines on the Diagnosis and Treatment of Diabetes-Related Foot Infections. Clinical Infectious Diseases. 2023;ciad527. doi:10.1093/cid/ciad527.
Fitridge R, et al. Intersocietal PAD Guideline: Peripheral artery disease in people with diabetes and a foot ulcer. 2023 update. IWGDF/ESVS/SVS.
Game F, et al. IWGDF Guideline on interventions to enhance healing of chronic foot ulcers in persons with diabetes. 2023 update. IWGDF.
IWGDF. Guidelines 2023 Update: Practical, Prevention, Classification, Infection, PAD, Offloading, Wound Healing and Charcot Neuroarthropathy.

Medical disclaimer: This article is intended for educational purposes and does not replace individualized assessment by a qualified healthcare professional. Patients with an active diabetic foot ulcer, infection, ischemia, gangrene, or suspected Charcot neuroarthropathy should receive prompt medical evaluation.