DVT and Pulmonary Embolism:
Symptoms, Treatment & Prevention

At a glance

FrequencyVenous thromboembolism (VTE) is among the most common cardiovascular conditions
What happensA blood clot (thrombus) forms in a deep vein (usually leg) and can travel to the lung (pulmonary embolism)
Hallmark DVTUnilateral leg swelling, pain, warmth, redness
Hallmark PESudden breathlessness, chest pain, palpitations — emergency!
GuidelinesNICE NG158, ESC PE Guidelines 2019
ICD-10I80 (Phlebitis and thrombophlebitis), I26 (Pulmonary embolism)

Table of contents

  1. What is DVT?
  2. What is pulmonary embolism?
  3. Symptoms
  4. Risk factors
  5. Diagnosis
  6. Treatment: anticoagulation
  7. Treatment duration
  8. Prevention
  9. How brite helps you
  10. FAQ
  11. Related topics

1. What is DVT?

In deep vein thrombosis (DVT) a blood clot (thrombus) forms in a deep vein — usually in the leg veins, less commonly in arm, pelvic or abdominal veins. The clot can obstruct blood flow and cause symptoms.¹

The greatest danger of a DVT is pulmonary embolism: if part of the clot breaks off and travels through the bloodstream into the lungs, it can block lung vessels. Pulmonary embolism can be life-threatening.¹,²

DVT and pulmonary embolism are jointly referred to as venous thromboembolism (VTE).

2. What is pulmonary embolism?

In pulmonary embolism (PE), a blood clot — usually from a deep leg vein thrombosis — blocks one or more vessels in the lung. Depending on clot size, PE can range from mild (few symptoms) to life-threatening (cardiovascular collapse).¹

Emergency: suspected pulmonary embolism With sudden breathlessness, chest pain or palpitations — particularly when one leg is also swollen — call 999 immediately (UK) or your local emergency number.

3. Symptoms

Deep vein thrombosis (leg)

  • Unilateral leg swelling — the hallmark; lower leg or whole leg
  • Pain — often in the calf, worse on weight-bearing or pressure
  • Warmth and redness or bluish discoloration
  • Tightness, heaviness
  • Shiny, stretched skin

Pulmonary embolism

  • Sudden breathlessness — the most common symptom
  • Pleuritic chest pain (sharp pain on breathing in)
  • Palpitations (tachycardia)
  • Anxiety, restlessness
  • Coughing blood (rare)
  • With severe PE: cardiovascular instability, dizziness, loss of consciousness
Symptoms can be non-specific The symptoms of pulmonary embolism are not always obvious. With suspicion, always seek medical help — better once too often than too rarely.

4. Risk factors

Virchow's triad describes the three main factors that promote thrombosis: slowed blood flow, vessel wall injury and increased clotting tendency.¹

Acquired risk factors

  • Immobilisation — prolonged bed rest, plaster cast, long flights or car journeys
  • Surgery — particularly hip and knee surgery, abdominal surgery
  • Cancer — markedly increases thrombosis risk
  • Obesity
  • Smoking
  • Age — risk increases with age
  • Previous DVT or PE — substantially elevated recurrence risk
  • Varicose veins — debated as an independent risk factor but often associated

Genetic risk factors (thrombophilia)

  • Factor V Leiden mutation — the most common genetic clotting disorder
  • Prothrombin mutation
  • Protein C, protein S or antithrombin deficiency
Thrombophilia testing not routine Genetic workup is generally not routinely recommended, only in specific situations (e.g. thrombosis at a young age, family history, recurrent thromboses).¹

5. Diagnosis

Deep vein thrombosis

  • Clinical probability: the Wells score helps estimate the probability of DVT and guides further workup.
  • D-dimer: a blood test. Elevated D-dimer can suggest thrombosis but is non-specific (also raised in infections, after surgery, in older age). Normal D-dimer with low clinical probability typically rules out thrombosis.
  • Compression ultrasound: ultrasound of the leg veins — the standard procedure. Fast, painless, no radiation.

Pulmonary embolism

  • CT pulmonary angiography (CTPA): the imaging of choice for suspected pulmonary embolism. Visualises clots in the pulmonary vessels directly.
  • Echocardiography: in unstable patients, can show signs of right heart strain and support the diagnosis.
  • Laboratory tests: D-dimer, troponin, BNP/NT-proBNP for risk stratification.

6. Treatment: anticoagulation

Treatment of VTE typically consists of anticoagulation (blood thinning), which prevents the clot from growing and gives the body time to break it down.¹

First line DOACs (direct oral anticoagulants)

Recommended in current guidelines as first-line therapy for most patients.¹

Rivaroxaban, apixaban, edoxaban, dabigatran
Advantages: fixed dosing, no regular blood tests (INR), fewer dietary interactions than vitamin K antagonists. The individual agents differ in dosing frequency and indications.
Established Vitamin K antagonists
Warfarin, phenprocoumon
Long-established. Require regular INR checks and a controlled vitamin K intake. Preferred in specific situations (e.g. antiphospholipid syndrome, mechanical heart valve).
Specific Low-molecular-weight heparin (LMWH)
Enoxaparin, tinzaparin and others
Typically used in the initial phase (as bridging) or in cancer patients. Subcutaneous injection.
Adjunct Compression therapy
Compression stockings
Can be used for leg swelling and symptom relief. The role of compression in preventing post-thrombotic syndrome is currently debated.
For severe pulmonary embolism Thrombolysis (medical clot dissolution) or, in rare cases, surgical/interventional procedures. These measures typically take place in an intensive care setting.

7. Treatment duration

The duration of anticoagulation depends on whether the thrombosis was triggered by a transient risk factor or occurred unprovoked.¹

Provoked VTE
E.g. after surgery, immobilisation, plaster cast — typically three to six months of anticoagulation. Recurrence risk after that is generally low.
Unprovoked VTE
No clearly identifiable trigger — recurrence risk is higher. Typically, prolonged or even lifelong anticoagulation is considered. The decision is made individually weighing recurrence risk against bleeding risk.
Cancer-associated VTE
Anticoagulation typically as long as the cancer is active or being treated.
Don't stop blood thinners on your own Even with stable findings, anticoagulants should never be paused or stopped without medical advice — recurrence risk is too high. Before operations, dental procedures or endoscopies, anticoagulation is always adjusted in consultation with the treating practice.

8. Prevention

  • Movement — avoid prolonged sitting and standing, move legs regularly, on flights get up and rotate the feet
  • Compression stockings — for long flights or when at higher risk
  • Hospital thromboprophylaxis — heparin injections after surgery and during bed rest (typically standard practice)
  • Smoking cessation
  • Weight control
  • Adequate hydration — particularly on flights

How brite helps you with VTE

Take DOACs on time, monitor INR with warfarin, check interactions with painkillers and antibiotics — treatment success rises and falls with adherence. Missed doses raise recurrence risk; too much raises bleeding risk. brite helps keep the balance.

  • Intake reminder — apixaban twice daily, rivaroxaban once daily with food, warfarin to individual schedule, LMWH injections in the initial phase: brite reminds you on time. With DOACs, time consistency is particularly important — half-life is short.
  • Drug interaction check — anticoagulants are highly interactive: NSAIDs (ibuprofen, diclofenac) increase bleeding risk, some antibiotics (clarithromycin) and antifungals can dangerously raise DOAC levels, St John's wort reduces effect. brite shows the critical combinations immediately.
  • Health journal — track INR values (with warfarin), leg circumference, symptoms, bleeding signs (nosebleeds, bruises, blood in urine) and treatment duration. At the next vascular or cardiology appointment, this is the basis for the "extend or stop" decision.
  • Digital medication plan — all medications clearly organised for GP, vascular medicine and cardiology. In emergencies or before operations the critical information: anyone on blood thinners must be able to inform every clinician immediately.
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FAQ: Common questions about DVT and pulmonary embolism

DVT is a blood clot in a deep vein (usually the leg). Pulmonary embolism occurs when part of this clot breaks off and travels to the lungs. PE is a complication of DVT and can be life-threatening.¹
It depends on the cause: for provoked VTE (e.g. after surgery), typically three to six months. For unprovoked VTE, prolonged or even lifelong anticoagulation is often considered. The decision is made individually.¹
Generally yes — exercise is even recommended. Sports with high injury risk (contact sports, martial arts) should typically be avoided as blood thinners increase bleeding risk. Discuss the activity level with the treating practice.
Direct oral anticoagulants (e.g. rivaroxaban, apixaban) — blood thinners in tablet form recommended as first-line treatment for most patients. Advantages over warfarin: fixed dosing, no regular INR checks, fewer dietary interactions.¹
Compression stockings can help with leg swelling and symptom relief. Routine recommendation for all patients is currently debated — newer studies suggest the benefit for preventing post-thrombotic syndrome may be smaller than previously thought. Discuss the decision individually with the practice.
Yes. Recurrence risk depends on the cause: for provoked thromboses (e.g. after surgery), it is low. For unprovoked thromboses, it is markedly higher. Prolonged anticoagulation can reduce the recurrence risk.¹
Yes — prolonged sitting with bent legs slows blood flow. Measures: get up regularly, rotate the feet, drink enough water, wear compression stockings if at higher risk.
Not routinely. Genetic workup is typically only recommended in specific situations: thrombosis at a young age, family history, recurrent thromboses. The decision is made by the treating practice.¹
Coronary heart disease Heart failure Obesity Medications when travelling Taking medications correctly Drug interactions

Sources

  1. NICE Guideline NG158: Venous thromboembolic diseases — diagnosis, management and thrombophilia testing. nice.org.uk
  2. ESC Guidelines on Acute Pulmonary Embolism (2019). escardio.org
  3. NHS: Deep vein thrombosis. nhs.uk
  4. Thrombosis UK. thrombosisuk.org
Medical disclaimer: This article is for general information only and does not replace medical advice, diagnosis or treatment. If pulmonary embolism is suspected, call your local emergency number immediately. Blood thinners should not be stopped, dose-adjusted or paused without medical advice. Treatment planning is always set individually by the treating practice. Last updated: April 2026.