Most leg and foot circulation problems are worked out over weeks, in an office, with time to ask questions. A few are not. This page is about telling those apart.
Call 911 now if any of these are happening
- Sudden trouble breathing, chest pain that is worse with a deep breath or cough, coughing up blood, a racing or irregular heartbeat, fainting or near-fainting. These can be signs of a blood clot that has travelled to the lungs.
- A leg or foot that suddenly becomes cold, pale or mottled, numb, weak, or severely painful — especially if it came on over minutes to hours. Blood supply to a limb can be cut off suddenly, and the window to save tissue is short.
- Any wound with spreading redness plus fever, chills, confusion, a rapidly worsening appearance, or a foul smell.
Outside the United States, use your local emergency number.
Get seen the same day or the next day
These need prompt assessment rather than an emergency room dash, but they should not wait for the next routine opening.
- One leg newly swollen, and the other is not — particularly with pain, tenderness in the calf, warmth, or a change in skin color. A clot in a deep leg vein is one of the possibilities, and only testing can sort it out. About half of people with a deep vein clot have no symptoms at all, so a mild picture is not reassurance.
- A break in the skin on the foot or lower leg that has not closed, or that is getting bigger, wetter, or more painful.
- New pain in the foot at rest, especially pain that wakes you at night and eases when you hang the foot over the edge of the bed.
- A dark, black, or leathery patch on a toe, heel, or the side of the foot.
- Any of the above in someone with diabetes, who is on dialysis, or who has known artery disease. The threshold for being seen is lower, not higher.
Book a routine appointment
- Cramping, aching, or tiredness in the calf, thigh, or buttock that comes on with walking and settles within a few minutes of stopping, then comes back at about the same distance.
- Both ankles or legs swelling over weeks or months, worse at the end of the day.
- Heavy, aching legs; visible varicose veins; itching, dryness, or brown staining of the skin around the ankles.
- Feet that are always cold, or that change color with temperature.
- Numbness, burning, or tingling in the feet.
- Any new leg or foot symptom you cannot account for, or a symptom you have had for a while that is now changing.
One thing worth being clear about
Nothing on this page can tell you that you are fine. These lists describe situations that need attention — they do not cover every presentation, and a serious problem can look mild from the outside. Symptoms overlap heavily between arteries, veins, nerves and other conditions entirely, and a clot in particular cannot be ruled in or out by how a leg looks and feels. If something is worrying you, that is reason enough to have it looked at.
Who to see
| Situation | A reasonable starting point |
|---|---|
| Anything on the 911 list above | Emergency department, by ambulance |
| Possible clot in a leg vein | Emergency department, urgent care, or same-day primary care — wherever can arrange an ultrasound today |
| A foot or leg wound that is not healing | Podiatry or a wound care service, and often both a vascular and a wound assessment |
| Leg pain on walking that goes away with rest | Primary care first, usually with an ABI test; vascular referral from there |
| Ongoing swelling, skin changes, varicose veins | Primary care, then vein or vascular specialist |
| Swelling that is not explained by veins, and has been going on a while | Primary care, with lymphedema services if that is the direction it points |
| Numbness or burning in the feet | Primary care or podiatry, to separate nerve problems from circulation problems |
This is not a rigid pathway. The right first stop is often simply the clinician who can see you soonest and knows your history.
Common questions
Can I wait and see whether the swelling settles on its own?
It depends on the pattern. Both legs swelling gradually, worse in the evening and better by morning, is common and usually worth a routine appointment rather than an urgent one. One leg swelling and the other not, especially over hours to days, is different — that pattern needs assessment now, because a clot is one of the explanations and it is time-sensitive.
My leg hurts when I walk. Is that an emergency?
Usually not. Pain that reliably comes on after a certain walking distance and eases within a few minutes of standing still is a pattern called claudication, and it is worked up in the office rather than the emergency room. Pain in the foot at rest, pain that wakes you at night, or a sudden change is a different matter and should be seen quickly.
Should I put compression on while I wait for an appointment?
Not on your own initiative. Compression is genuinely useful for some vein and swelling problems and can be harmful when the arterial blood supply to the leg is poor — which is precisely what has not been assessed yet. If nobody has checked your circulation and told you compression is appropriate, that check comes first.
How quickly does a non-healing wound need attention?
Sooner than most people assume. A break in the skin below the knee that has not closed in a couple of weeks, or that is getting larger or more painful, should be looked at. If there is spreading redness, fever, or a change in smell, that is same-day.
Does a normal-looking leg mean my circulation is fine?
No. Artery disease in the legs is often silent, and about half of deep vein clots cause no symptoms. Appearance is a poor test. If you have risk factors — diabetes, smoking, kidney disease, a past clot, or a family history — the way to know is to have the circulation measured, not to look at the leg.
Where to go next
Sources
- Centers for Disease Control and Prevention. About Venous Thromboembolism (Blood Clots).
- Society for Vascular Surgery. Acute Limb Ischemia.
- National Heart, Lung, and Blood Institute. Peripheral Artery Disease — Symptoms.
- NHS. Deep vein thrombosis (DVT).
- NHS. Leg ulcer — diagnosis.
Written by Tom Biernacki, DPM, FACFAS. Published 20 September 2026. This page is general education, not medical advice, and it has not yet been through the independent clinical review described on our medical review page.