Quick answer. Peripheral arterial disease (PAD) occurs when arteries to the legs narrow due to atherosclerosis (fatty plaque), reducing blood flow. The classic symptom is intermittent claudication, calf pain that comes on with walking and eases with rest. PAD is strongly linked to smoking, diabetes, high blood pressure and high cholesterol, and is a major cause of limb loss in Singapore, particularly among people with diabetes. Advanced PAD can cause rest pain, non-healing wounds and gangrene. Acute limb ischaemia, a sudden painful, pale, cold, numb leg, is an emergency requiring immediate A&E care. PAD is diagnosed with the ankle-brachial index (ABI) and treated with risk-factor control, medication, and procedures such as angioplasty or bypass for limb salvage. This is general information, not medical advice.
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Peripheral arterial disease (PAD) develops when the arteries supplying the legs become narrowed or blocked by fatty plaque (atherosclerosis), starving the leg muscles and tissues of blood. Many people first notice cramping calf pain when walking. PAD is common in Singapore because its main drivers, smoking, diabetes, high blood pressure and high cholesterol, are widespread, and it is a leading cause of leg amputation, especially in people with diabetes. This guide explains the symptoms, the diabetic link to limb salvage, how PAD is diagnosed, when it becomes an emergency, and the treatment options available.
At a glance
| Stage | Typical features | Action |
|---|---|---|
| Early / mild | No symptoms, or mild leg fatigue; risk factors present | See a doctor for screening and risk-factor control |
| Intermittent claudication | Calf, thigh or buttock pain on walking that eases with rest | Medical review; supervised exercise and medication |
| Critical limb ischaemia | Pain at rest, non-healing wounds or ulcers, gangrene | Urgent vascular referral to save the limb |
| Acute limb ischaemia | Sudden painful, pale, cold, numb or weak leg | Emergency, call 995 or go to A&E immediately |
What is PAD and what causes it?
PAD is caused by atherosclerosis, the build-up of fatty plaque that narrows and hardens arteries, in this case the arteries carrying blood to the legs and feet. As the channel narrows, muscles cannot get enough oxygen-rich blood during activity. The main risk factors are smoking, diabetes, high blood pressure and high cholesterol, all common in Singapore’s population. Smoking is particularly harmful and can accelerate the disease, and PAD frequently coexists with heart disease and stroke risk because the same plaque process affects arteries throughout the body.
Recognising the symptoms (claudication)
The hallmark symptom is intermittent claudication: pain, cramping or tiredness in the calf, thigh or buttock that comes on after walking a certain distance and eases with a few minutes of rest. SingHealth illustrates this with a patient who develops calf pain after walking around 100 metres. Other signs include numbness or weakness in the legs, coldness in the lower leg or foot, a change in skin colour, poor nail or hair growth on the legs, and wounds or sores on the feet or toes that heal slowly. As blood flow worsens, pain may occur even at rest, often in the foot and worse at night.
The diabetic link and limb salvage
Diabetes is a major driver of PAD in Singapore. High blood sugar damages blood vessels and nerves, so people with diabetes may have reduced sensation and not feel a developing foot wound, while poor circulation prevents it from healing. SingHealth notes that a significant proportion of older people with diabetes develop PAD. This combination makes the diabetic foot especially vulnerable to infection, ulcers and gangrene, and PAD is a leading cause of lower-limb amputation. Good blood sugar control, daily foot checks, well-fitting footwear and prompt attention to any wound are central to limb salvage.
When PAD is urgent or an emergency
Seek emergency care immediately, call 995 or go to A&E, if a leg or foot suddenly becomes painful, pale, cold, numb or weak; this may be acute limb ischaemia caused by a sudden blockage, and the limb can be lost within hours without rapid treatment. Arrange urgent (non-emergency but prompt) vascular review for warning signs of critical limb ischaemia: persistent pain in the foot at rest, a non-healing wound or ulcer, blackened tissue (gangrene), or a spreading foot infection, particularly if you have diabetes.
Diagnosis and treatment
PAD is often diagnosed with the ankle-brachial index (ABI), which compares blood pressure at the ankle with the arm; a value around 0.9 to 1.0 is normal, while lower values indicate significant disease. Imaging such as ultrasound, CT or MR angiography maps the blockages. Treatment starts with aggressive risk-factor control: stopping smoking, managing diabetes, blood pressure and cholesterol, a structured walking or exercise programme, and medications such as antiplatelet agents (for example aspirin or clopidogrel) and statins. When symptoms are severe or the limb is threatened, procedures such as angioplasty (sometimes with a stent) or bypass surgery restore blood flow and help save the limb.
Living with PAD and prevention
PAD signals a higher risk of heart attack and stroke, so managing it protects more than your legs. Stopping smoking is the single most important step. Stay active within your doctor’s guidance, since walking exercise can improve walking distance over time. Keep diabetes, blood pressure and cholesterol well controlled, care for your feet daily, and report any new wound, colour change or rest pain promptly. Regular review with your doctor or a vascular specialist helps catch progression early.
Daily foot care if you are at risk
For anyone with PAD, particularly those who also have diabetes, looking after the feet each day is one of the most practical ways to avoid serious problems. Check both feet daily for cuts, blisters, redness, swelling or changes in colour, using a mirror or asking a family member to inspect areas you cannot see. Wash and dry your feet carefully, especially between the toes, and apply moisturiser to dry skin but not between the toes. Wear well-fitting, supportive footwear and never walk barefoot. Have toenails trimmed carefully, and seek help from a podiatrist or doctor for corns, calluses or ingrown nails rather than treating them yourself. Report any wound that is not healing promptly, as early attention can prevent a small problem from becoming a limb-threatening one.
Questions to ask your doctor
- What is my ankle-brachial index, and what does it mean for me?
- How far should I aim to walk, and is a supervised exercise programme available?
- Are my diabetes, blood pressure and cholesterol well enough controlled?
- Which warning signs should make me seek urgent or emergency care?
- Do I need a referral to a vascular specialist?
Common questions
Can walking really help if it brings on pain?
Yes. Within your doctor’s guidance, regular walking that brings on mild claudication, followed by rest, can gradually improve the distance you are able to walk over several weeks to months. It should be done as part of a planned programme, not pushed to severe pain.
Does PAD only affect the legs?
No. The same plaque process can affect arteries to the heart and brain, so PAD signals a higher risk of heart attack and stroke. Controlling your risk factors protects your whole body, not just your legs.
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- DVT
- Leg swelling and spider veins
Sources
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