One swollen, painful calf is a same-day problem. Not because of the leg, but because of the lung.
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A deep vein thrombosis is a blood clot forming in one of the deep veins, almost always in the leg. The leg itself is rarely the danger.
The danger is that part of the clot breaks off and travels to the lungs. That is a pulmonary embolism, and it can be fatal. Everything about how urgently DVT is treated follows from that one fact.
The classic picture is one leg, not both — swollen, aching or cramping in the calf, warm to touch, and sometimes discoloured. Swelling of both legs together is usually something else entirely, most often venous insufficiency, heart or kidney problems, or a medication such as amlodipine.
Around half of DVTs occur with no obvious trigger. The other half follow something identifiable: surgery, immobility, a long flight, pregnancy, cancer, or an oestrogen-containing medication.
Typically in one leg only:
These are an emergency, and they can occur without any leg symptoms at all:
The Wells score is used to put suspected DVT into likely or unlikely, based on features such as one-sided swelling, calf circumference difference, recent immobility or surgery, active cancer, and whether an alternative diagnosis is at least as plausible.
That score determines what happens next, which is why the assessment is structured rather than impressionistic.
Where DVT is likely, an ultrasound should be done within four hours. If that is not possible, an interim dose of anticoagulant is given and the scan arranged within 24 hours.
That is not a target anyone should be waiting politely past — it is the standard, and it is worth knowing if you are being asked to come back next week.
Where suspicion is high but the first scan is negative, a repeat scan about a week later is recommended, because a small calf clot can extend.
An unprovoked DVT prompts a review for an underlying cause, including a check for symptoms and signs of cancer. Testing for inherited clotting disorders is not routine and is reserved for specific situations — it rarely changes treatment.
Suspected DVT is not something to book an online appointment for. It needs assessing today, in person.
If you have a newly swollen, painful calf — particularly one leg only — contact NHS 111 or your GP the same day, or go to an urgent treatment centre. Most areas run a DVT pathway that can scan you within hours.
We cannot scan your leg, and we will not start anticoagulation on a remote suspicion. DVT is confirmed by ultrasound, and treatment follows the scan.
Call 999 immediately if you have:
These suggest a pulmonary embolism. Do not wait, and do not drive yourself.
Seek same-day assessment — today, not tomorrow — if:
Do not massage or rub the leg, and keep walking to a minimum until you have been assessed.
Risk rises with journeys over about four hours, and it is modest for most people. Sensible measures:
If you have had a previous DVT, are pregnant, have had recent surgery or have cancer, get individual advice before a long flight rather than relying on general guidance.
You should be assessed for clot risk before any significant operation, and given stockings, injections or both. Ask what your plan is — it is standard practice and occasionally overlooked.
Move as early as you safely can afterwards. Early mobilisation is one of the most effective preventive measures there is.
The combined pill and oral HRT raise clot risk; HRT absorbed through the skin does not raise it in the same way. If you have risk factors and are on oral HRT, switching route is a conversation worth having.
Suspected DVT is one of the clearest cases where the NHS is not just cheaper but genuinely better set up than any private alternative.
If you think you have a DVT, ring 111 or your GP today. Booking a private video consultation would delay you and would end with us telling you the same thing.
This page follows NICE NG158, Venous thromboembolic diseases: diagnosis, management and thrombophilia testing.
NICE does not recommend compression stockings to prevent post-thrombotic syndrome after DVT, though they may still be used to relieve symptoms. This reversed earlier practice and is not widely known.
Reviewed against NICE NG158 current at the date shown above.
You often cannot with confidence, and that is exactly why it needs assessing.
Swelling of one calf, warmth, and no clear injury tilt it towards a clot — particularly after surgery, immobility or a long flight. Get it looked at today rather than waiting to see.
Usually not. DVT is nearly always one-sided.
Swelling of both legs is more often venous insufficiency, heart or kidney problems, or a medicine such as amlodipine — still worth assessing, but a different question.
It is a marker of clot breakdown, and it is far better at ruling DVT out than ruling it in.
It rises with infection, injury, pregnancy, surgery, cancer and simply with age, so a positive result on its own means very little — it means you need the scan.
At least three months. Longer where the clot had no obvious trigger, or where risk factors persist.
That decision weighs recurrence risk against bleeding risk, and it is worth understanding rather than accepting passively.
Usually yes, once treated and stable — but get individual advice before booking a long-haul flight.
Your risk is not the general population's, and the sensible precautions differ accordingly.
The combined pill raises the risk by roughly two to three times a low baseline. That sounds alarming until you note the risk in pregnancy is considerably higher.
It is a real risk to weigh, not a reason for blanket avoidance — and it is why migraine with aura and a clot history matter so much in that decision.
No, and this distinction matters. Oral oestrogen raises clot risk; oestrogen through the skin — patch, gel or spray — does not carry the same increase.
For anyone with clot risk factors, the transdermal route is the preferable one, and it is still not offered as often as it should be.
No. Aspirin is not recommended for preventing travel-related clots.
Move, hydrate, and use properly fitted flight socks if you have risk factors.
Recurrence is more likely after an unprovoked clot than one with a clear trigger.
That is precisely why the duration of anticoagulation differs between the two, and why the reason for your clot shapes the plan.
August 30, 2026
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