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DVT explained: leg clot symptoms and how urgent they are | CION Cancer Clinics
A DVT, a clot in a deep leg vein, usually shows as one leg that is swollen, aching, warm or darker than the other. Get it checked at a hospital the same day. If you also feel suddenly breathless, have chest pain or cough up blood, call 108 now. This page explains the signs, what the hospital will do, and what a symptom list cannot tell you. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Could this swollen, painful leg be a clot?
- What does a leg clot usually feel and look like?
- What happens when you go in with a suspected DVT?
- What do the words on a DVT scan report mean?
- What else can make a leg swell, and who is more at risk?
- What do families often get wrong about leg clots?
- Common questions about DVT symptoms
The short answer
Could this swollen, painful leg be a clot?
It could be. A clot in a deep leg vein, called DVT (deep vein thrombosis), usually shows as one leg that is swollen, aching or tender, and warmer or darker than the other. If that sounds like your leg, get it checked at a hospital today, not next week.
What a DVT actually is
Your leg has veins near the skin and veins deep inside the muscle. A DVT is a clot that forms in one of the deep veins, most often in the calf or thigh. It partly blocks the blood flowing back to the heart. Blood then backs up in the leg, which is why the leg swells and aches.
Why it matters that you act today
The clot itself is treatable. The danger is that a piece breaks off and travels to the lungs. That is called a pulmonary embolism, and it can be life-threatening. Starting treatment early lowers that chance. A scan is the only way to know, because the signs of a DVT and of a strained muscle can look very alike.
Some clots cause no signs at all. A normal-looking leg does not rule one out if your doctor is already worried.
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When it cannot wait even a few hours
If a swollen or painful leg comes with sudden breathlessness, chest pain that is worse when you breathe in, coughing up blood, a racing heartbeat or fainting, call 108 or go to the nearest emergency department now. These can mean the clot has reached the lungs. Do not drive yourself, do not wait to see if it settles, and do not rub or massage the leg.
Not sure whether this applies to you?
Ask an oncologistWhat to look for
What does a leg clot usually feel and look like?
Compare the painful leg with the other one. The difference between the two legs matters more than any single sign.
Swelling in one leg
The calf, ankle or whole leg looks fuller than the other side. Your slipper or trouser may feel tight on that leg only.
Swelling in both legs is less typical of a clot, but still needs a doctor.Pain or tenderness
Often a cramp-like ache or heaviness in the calf or thigh. It may hurt more when you stand, walk or press on the muscle.
Warmth and colour change
The skin over the sore area may feel warm to touch. It may look red, or darker than usual on brown skin, where redness is harder to see.
Veins you can see
Surface veins on the leg may stand out more, because blood is taking a detour around the blocked deep vein.
Tell the doctor if you also have
- Cancer, or treatment for it
- Recent surgery or a long bed stay
- A past clot, or a family history of clots
At the hospital
What happens when you go in with a suspected DVT?
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Questions and examination
The doctor asks when the swelling started, about recent travel, surgery, pregnancy, cancer and any past clots. Both legs are examined and often measured, to compare the swelling.
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A blood test called D-dimer
This looks for a substance released when clots break down. A normal result, in someone at low risk, makes a clot unlikely. A raised result does not prove a clot, because infection, surgery and cancer can all raise it too.
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An ultrasound of the leg
A Doppler ultrasound uses sound waves to see blood flow in the deep veins. It needs no injection and no radiation. This is the scan that usually confirms or rules out a DVT.
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Treatment, if a clot is found
Most people are started on a blood thinner, called an anticoagulant. It stops the clot growing while your body slowly breaks it down. Many people are treated without staying in hospital.
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Follow-up
Your team decides how long treatment lasts and whether the cause needs more tests. Never stop or change a blood thinner on your own.
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On your report
What do the words on a DVT scan report mean?
- Proximal DVT
- A clot in the deep veins above the knee or behind it. These carry the greater risk of travelling to the lungs.
- Distal or calf DVT
- A clot in the deep veins below the knee. Some are treated, some are watched with a repeat scan. Your doctor decides.
- Non-compressible vein
- The vein did not flatten when the probe pressed on it. This is the usual sign that a clot is filling it.
- Superficial thrombophlebitis
- A clot in a vein just under the skin, with a tender red cord. It is usually less dangerous, but still needs a doctor to check it.
- Anticoagulant
- A blood thinner. It does not dissolve the clot directly. It stops it growing so the body can clear it.
Not always a clot
What else can make a leg swell, and who is more at risk?
Many swollen legs are not clots. A pulled calf muscle, a skin infection called cellulitis, a burst fluid sac behind the knee, varicose veins, and heart, kidney or liver problems can all cause swelling or pain. That is exactly why you need a scan rather than a guess.
People with a higher chance of a clot
The chance rises after major surgery, especially on the hip or knee, and after any long spell in bed or a long journey sitting still. It rises with cancer and some cancer treatments, pregnancy and the weeks after delivery, hormone tablets, being overweight, older age, and a personal or family history of clots.
If you are having treatment for cancer or a blood disorder
Clots are more common during cancer treatment, and a central line or PICC line in the arm can cause a clot in that arm. Arm swelling on the side of your line needs the same urgency as a swollen leg. Tell the emergency doctor about your diagnosis, and bring your treatment summary.
Having risk factors does not mean you have a clot, and having none does not rule one out.Commonly believed
What do families often get wrong about leg clots?
"It is only a muscle pull. A hot oil massage will fix it."
It may be a strain, but only a scan can tell. Rubbing or pressing hard on a leg with a clot is not advised. Get it checked first, and leave massage until a clot has been ruled out.
"No redness, so it cannot be a clot."
Many clots cause swelling and ache with little colour change, and on darker skin redness is easy to miss. Some cause no signs at all. One swollen, aching leg is reason enough to be seen.
"Clots only happen to old people."
Age raises the chance, but young adults get clots too, especially after surgery, during pregnancy or after delivery, on hormone tablets, or with an inherited clotting tendency.
"The swelling went down, so we can stop the tablets."
Feeling better does not mean the clot has gone or the risk has passed. Stopping a blood thinner early can let a new clot form. Only your treating team should change or stop it.
Questions we are asked
Common questions about DVT symptoms
Can I wait until tomorrow to get my leg checked?
It is safer not to. If one leg is newly swollen and painful, go to a hospital the same day. If you also feel breathless, have chest pain or cough up blood, call 108 at once. A clot found early is simpler to treat, and a normal scan also puts your mind at rest.
How is a clot different from a muscle cramp?
A cramp usually comes on suddenly, tightens hard and eases within minutes with stretching. A clot tends to build, and the ache stays. It often comes with swelling or warmth in that leg. The overlap is real, though, which is why a doctor and an ultrasound are needed to tell them apart.
Can a DVT happen in the arm?
Yes. It is less common, but it happens, especially in people with a central line, PICC line or port for chemotherapy, and sometimes after heavy repeated arm use. Look for swelling, ache or a heavy feeling in one arm, hand or the side of the neck, and get it checked the same day.
Does a raised D-dimer mean I have a clot?
No. D-dimer is often raised by infection, recent surgery, pregnancy, older age and cancer. A normal result helps rule a clot out in someone at low risk. A raised result simply means more testing, usually an ultrasound. Reference ranges also differ between laboratories, so read it with your doctor.
Should I rest in bed or keep walking?
Before a clot is ruled out, get checked rather than testing the leg. Once a DVT is diagnosed and treatment has started, most people are encouraged to move around normally. Your doctor may also suggest raising the leg when sitting. Ask your team what suits you, because advice differs.
Will I need to stay in hospital?
Many people with a leg clot are treated at home with tablets and regular follow-up. A hospital stay is more likely if the clot is large, if it has reached the lungs, if you have a high bleeding risk, kidney problems or cancer, or if there is no one at home to help.
Could the clot mean I have cancer?
Most clots are not caused by cancer. Surgery, immobility, pregnancy and hormones are far more common reasons. Sometimes, when a clot has no clear cause, the doctor checks for other conditions, including cancer. That is a careful step, not a sign that they expect to find it.
How can CION help once a clot is found?
If a clot keeps coming back, has no clear cause, or happens during cancer treatment, a haematologist can review the full picture. CION's haematology team looks at your reports, discusses complex cases at a tumour board, and coordinates any further tests with qualified centres. Ask where each test will be done.
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Deep vein thrombosis (DVT)
- NHLBI — Venous thromboembolism
- American Society of Hematology — Blood clots
- NICE — Venous thromboembolic diseases: diagnosis, management and thrombophilia testing (NG158)
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Pulmonary Embolism: Recognising ItThe emergency signs when a clot reaches the lungsWhy Clots Happen: Risk Factors ExplainedWhat raises your chance of a clotHow Long to Stay on Blood ThinnersWhat decides the length of treatment after a DVTCancer-Associated ThrombosisIf the clot happened during cancer treatmentClotting, Thrombosis and AnticoagulationThe full guide to clots and blood thinners
Talk to us
Found a clot, or worried about one that keeps coming back?
Send us your scan and blood reports. Our haematology team will look at them and help you plan the next step. For breathlessness or chest pain, call 108 first.