Compression is one of the most useful things in leg care and one of the few genuinely capable of causing harm. The difference comes down to a measurement that takes fifteen minutes and that most people buying socks online have never had.
The short version
If nobody has assessed the arterial blood supply to your leg, do not start compression on your own. Compression supports the venous system by squeezing fluid back in. Arterial blood has to get into the leg against that same squeeze. In a leg where arterial flow is already marginal, adding external pressure can reduce it further — and the people most likely to be in that position, those with diabetes and reduced sensation, are the least likely to feel it going wrong.
Who should be assessed before using compression
- Anyone who has not had their arterial circulation checked — which is most people
- Anyone with diabetes, particularly with reduced sensation in the feet
- Anyone with known or suspected peripheral artery disease, or leg pain on walking
- Anyone with chronic kidney disease
- Anyone with a wound or ulcer on the leg or foot
- Anyone with numbness or reduced sensation from any cause
- Anyone with uncontrolled heart failure — shifting fluid back into the circulation has consequences there
- Anyone with a suspected clot or active infection in the leg
That list covers a large share of the people who go looking for compression socks in the first place, which is the point.
What the assessment involves
- An ankle-brachial index, and a toe pressure if you have diabetes or kidney disease, because the ABI can read falsely normal in those groups. More on these tests →
- Examination of the leg and foot — pulses, skin, sensation, any wound.
- A decision about strength. Full compression, reduced compression, or none — based on the numbers, not on what looks about right.
- Measurement and fitting, so the garment does what it is meant to. Fit and pressure labels →
- A plan for checking the skin, and for what to do if something changes.
Warning signs once you are wearing it
Take the garment off and get advice if you notice:
- New or increasing pain, particularly in the foot or toes
- Toes that become pale, blue, dusky or cold
- New numbness or tingling that was not there before
- Deep marks, blisters, or any break in the skin where the garment sits
- Skin color changes at the top band or over the shin bone
Some initial unfamiliarity is normal. Pain is not, and neither is a color change.
“It helps circulation” is the phrase to distrust
Marketing uses “improves circulation” as though the leg had one circulation. Compression supports venous return. It does not improve arterial delivery, and it is not a treatment for arterial disease — nor for cold feet, unless the cold feet are from something compression addresses. Buying compression to fix a suspected artery problem is the specific mistake this page exists to prevent.
Where compression genuinely earns its place
- Chronic venous insufficiency — the mainstay of management, and it slows skin damage
- Venous leg ulcers — compression bandaging is the treatment, applied by trained clinicians after an arterial assessment
- Lymphedema — part of a specialist program with individually specified garments
- After a DVT, where it is advised, for symptoms and post-thrombotic change
- Occupational and travel swelling, in people with healthy arteries
Common questions
Are light over-the-counter socks safe for anyone?
Lower-pressure garments carry less risk than medical-grade ones, and for a person with healthy arteries and tired legs they are generally fine. The problem is that the people most drawn to them — older, diabetic, with swelling and cold feet — are exactly the group whose arteries most need checking first. “Low pressure” reduces the risk; it does not replace the assessment.
My legs feel better with them on. Does that mean they are fine?
Not on its own. Compression often feels supportive regardless, and in a foot with reduced sensation an adverse effect may not be felt at all. Feeling better is not the same as being safe, unfortunately.
Can I wear them at night?
Standard graduated compression is generally worn during the day and removed at night, because lying down removes most of the venous pressure it is countering. Night-time garments exist for specific conditions and are prescribed deliberately. Follow what you were told rather than a general rule.
What if I have both artery and vein problems?
That is common, and it is the situation where this decision needs a clinician rather than a rule. Depending on the arterial pressures, compression may be used at reduced strength, used under supervision, or avoided. It is not automatically off the table — but it is not a decision to make from a product page.
Where to go next
Sources
- NHS. Leg ulcer — diagnosis and treatment.
- NHS. Lymphoedema — treatment.
- National Heart, Lung, and Blood Institute. PAD — Diagnosis.
- Society for Vascular Surgery. Chronic Venous Insufficiency.
Written by Tom Biernacki, DPM, FACFAS. Published 20 September 2026. General education, not medical advice. Whether compression is appropriate for your leg is a clinical decision.