Leg swelling after robotic prostate surgery can have several causes. If pelvic lymph nodes were removed, changes in lymph drainage can cause swelling in one or both legs, while surgery and reduced mobility also temporarily increase your risk of developing a blood clot.
Because a deep vein thrombosis can become serious, new swelling in one leg particularly with pain, warmth or skin colour changes should be assessed promptly.
Is Leg Swelling Normal After Prostate Surgery?
Some swelling can occur after major pelvic surgery, particularly when your pelvic lymph nodes have been removed. Prostate Cancer UK notes that lymph-node removal can sometimes result in swelling of your scrotum and one or both legs.
However, you should not automatically assume that new leg swelling is postoperative fluid or lymphoedema. New, sudden, painful or predominantly one-sided swelling should be assessed promptly because DVT and other complications may produce similar symptoms.
Why Does Surgery Increase the Risk of Blood Clots?
Recent surgery, cancer and reduced mobility are recognised risk factors for deep vein thrombosis, or DVT. These factors can increase your risk of developing a blood clot in one of the deep veins of your leg during your recovery.
This is why preventing blood clots is an important part of your prostatectomy recovery. Your clinical team may recommend measures such as early movement and prescribed blood-thinning treatment when appropriate.
What Is a DVT?
A DVT is a blood clot that develops in a deep vein, most commonly within your leg. You may notice swelling, pain, tenderness, warmth or changes in skin colour in the affected leg.
A DVT can become dangerous if part of the clot travels to your lungs. This can cause a pulmonary embolism and requires urgent medical assessment.
What Does DVT Swelling Look Like?
A DVT most commonly causes swelling in one leg, although both legs can occasionally be affected. You may also experience throbbing or cramping pain in your calf or thigh, warmth, discoloured skin or swollen veins that feel tender.
You do not need to have every symptom for DVT to be possible. If you develop new unexplained one-sided leg swelling after your recent surgery, you should seek urgent same-day assessment through your surgical team, GP or NHS 111.
Can a DVT Cause Calf Pain?
Yes. DVT pain commonly occurs in your calf or thigh and may occur alongside swelling. You may also notice tenderness, warmth or changes in the skin around the affected area.
Any unexplained combination of these symptoms after your recent surgery needs prompt assessment. You should contact your clinical team urgently if you develop new calf or thigh pain with swelling.
Can You Have a DVT Without Severe Pain?
Yes. DVT does not always cause severe pain, so you should not wait for significant discomfort before seeking advice if one leg becomes unexpectedly swollen after surgery. Contact your clinical team promptly if you develop new or unexplained swelling in one leg.
DVT Symptoms to Watch For
| Symptom | What It May Mean | What To Do |
| One-leg swelling | May indicate a possible DVT | Contact your clinical team promptly |
| Mild leg pain | DVT can occur without severe pain | Seek medical advice if swelling is new |
| No pain | DVT does not always cause noticeable pain | Do not ignore unexpected swelling |
| Leg warmth | The affected area may feel warmer than usual | Discuss with your clinical team |
| Leg redness or colour change | Can occur with a DVT | Seek medical assessment |
| Sudden unexplained symptoms | New symptoms after surgery need assessment | Contact your clinical team promptly |
Why Is a Pulmonary Embolism Dangerous?
A pulmonary embolism occurs when a blood clot blocks a blood vessel in your lungs. This can reduce blood flow through your lungs and affect the amount of oxygen reaching your body.
It can be life-threatening if it is not treated quickly. You should seek urgent medical attention if you develop symptoms that could indicate a pulmonary embolism.
What Are the Warning Signs of a Pulmonary Embolism?
A pulmonary embolism can cause sudden unexplained breathlessness, chest pain that may become worse when you breathe in, coughing up blood or a very fast heartbeat. You may also have pain, redness or swelling in one leg if the clot began as a DVT.
Call 999 or attend A&E if you develop chest or upper-back pain, severe breathing difficulty, a very fast heartbeat, fainting or collapse. Sudden breathlessness or coughing up blood also requires urgent medical assessment and should not be assumed to be part of normal postoperative recovery.
Why Are You Encouraged to Walk After Surgery?
Your surgical team will normally encourage you to begin gentle mobilisation soon after your operation. Regular movement supports your circulation and helps reduce the risk of postoperative DVT while also supporting your general recovery. Prostate Cancer UK advises gradual mobilisation soon after prostate surgery for this reason.
You should increase your activity gradually according to your discharge instructions. Walking helps reduce your clot risk but does not eliminate it, so you should still seek assessment if you develop symptoms suggestive of DVT.
Can Lymph-Node Removal Cause Leg Swelling?
A lymphocele is a collection of lymph fluid that can form within the pelvis after pelvic lymph nodes have been removed. Many are small, but a larger or symptomatic lymphocele may cause pelvic discomfort and sometimes needs imaging, drainage or other treatment.
A lymphocele is different from lymphoedema, which causes swelling within tissues such as the legs or genital area. If you develop new pelvic swelling, persistent discomfort or unexplained leg swelling after lymph-node surgery, your clinical team can assess whether a lymphatic complication or another cause is present.
What Is Lymphoedema?
Lymphoedema occurs when fluid accumulates in your body tissues because your lymphatic system is not draining it effectively. This can cause swelling, tightness or a feeling of heaviness in the affected area.
Your legs are among the areas commonly affected. Lymphoedema can develop after pelvic lymph-node removal and should be assessed if your swelling persists or gradually increases.
What Does Lymphoedema Feel Like?
Your affected leg may feel swollen, heavy or achy, and movement may become more difficult. Early swelling can sometimes feel soft, leave a temporary dent when pressed and change throughout the day.
- Swelling: Your leg may appear larger or feel noticeably fuller than usual
- Heaviness: You may experience a heavy or weighted sensation in the affected leg
- Aching: Some people notice discomfort, tightness or an aching sensation around the swollen area
- Daily changes: Swelling may become more noticeable after prolonged standing or towards the end of the day
- Movement changes: Increasing swelling can make your leg feel less comfortable or make movement more difficult
Persistent or increasing swelling should be discussed with your clinical team so the cause can be assessed. Early assessment can help your healthcare team determine whether the changes are related to lymphoedema or another condition.
Can Lymphoedema Develop Later?
Yes. Lymphatic swelling does not always appear immediately after surgery. Cancer treatment that damages or removes lymph nodes can cause secondary lymphoedema, so new leg swelling later in your recovery still deserves assessment.
You should contact your clinical team if you develop new, persistent or increasing leg swelling, even if it occurs weeks or months after your surgery.
How Is Lymphoedema Treated?
If your swelling is confirmed to be lymphoedema, your treatment may include specialist compression garments, exercise, skin care and techniques intended to support lymph drainage. Early specialist advice can help you learn how to manage the swelling and protect your skin.
You should have unexplained postoperative swelling assessed before buying tight compression garments yourself because DVT or another postoperative complication may need to be excluded first. The anti-embolism stockings you may receive after surgery to prevent DVT are also not necessarily the same as specialist compression garments prescribed for lymphoedema.
Can Lymphoedema Become Infected?
Lymphoedema can increase your susceptibility to cellulitis because persistent tissue swelling can make the skin more vulnerable to infection. Your affected area may become more red, hot, painful or swollen, and you may develop a temperature or flu-like symptoms.
You should obtain prompt medical advice if these changes occur. UCLH advises contacting your GP without delay for suspected cellulitis, or using NHS 111 or urgent services if your GP is unavailable.
Should You Elevate Your Legs?
Elevation may help some types of leg swelling, and gentle movement is often useful for circulation and lymph drainage. However, you should not use elevation as a substitute for assessment when your swelling is unexplained, sudden, painful or mainly affects one leg.
If your team confirms lymphoedema or uncomplicated postoperative oedema, they can advise whether elevation, exercise or compression is appropriate for you.
When Should You Contact Your Surgical Team?
You should obtain prompt advice if your leg swelling is new, increasing or clearly greater on one side, particularly when you also develop calf or thigh pain, warmth, tenderness or a change in skin colour.
NHS guidance advises urgent GP or NHS 111 assessment if you think you may have a DVT. Following recent robotic prostate surgery, you can also use the urgent postoperative contact number provided by your surgical centre.
When Is It an Emergency?
Call 999 if suspected DVT or new leg swelling is accompanied by chest or upper-back pain, severe breathing difficulty, fainting or collapse. You should also seek emergency help for severe breathing difficulty, chest or upper-back pain, a very fast heartbeat, fainting or collapse because these can indicate pulmonary embolism.
You should not drive yourself to hospital if you have severe symptoms. Tell the emergency team that you have recently undergone prostate cancer surgery and whether you are taking postoperative anticoagulant injections.
UK Guidance Note
NICE recommends assessing people having surgery for both their risk of venous thromboembolism and their risk of bleeding. For abdominal surgery, including urological surgery, mechanical VTE prophylaxis such as anti-embolism stockings or intermittent pneumatic compression should be started for appropriate patients, and pharmacological prophylaxis should be added for at least seven days when the risk of VTE outweighs the risk of bleeding.
After major abdominal cancer surgery, NICE advises considering extension of pharmacological prophylaxis to 28 days after the operation. Your own prostatectomy discharge plan should take priority because the type and duration of blood-thinning injections and compression stockings depend on your individual risk and local pathway.
Myth vs Fact
| Myth | Fact |
| Your leg swelling is automatically normal after prostate surgery. | Your swelling may have several causes, and new or increasing swelling deserves assessment. |
| Your DVT always causes severe calf pain. | Your DVT can cause mild symptoms or mainly swelling. |
| Your DVT must affect only one leg. | Your DVT usually affects one leg, but bilateral involvement is possible. |
| Your blood-thinning injections guarantee that you cannot develop a DVT. | Your injections reduce your risk but cannot remove it completely. |
| Your swollen legs after lymph-node removal must be lymphoedema. | Your team may also need to consider DVT, postoperative oedema or a lymphocele. |
| Your lymphoedema always appears immediately after surgery. | Your swelling can develop weeks, months or even later after lymphatic damage. |
| Any compression stocking will treat your lymphoedema. | Your lymphoedema compression should be appropriately selected after assessment. |
| Your red, hot swollen leg is simply lymphoedema. | Your symptoms may indicate cellulitis or DVT and need prompt assessment. |
| Your chest pain after prostate surgery can wait until your next appointment. | Your chest pain with suspected DVT or breathlessness can indicate PE and requires emergency help. |
Key Takeaways
- Your leg swelling can have more than one cause after robotic prostatectomy.
- Your recent cancer surgery temporarily increases your risk of DVT.
- Your DVT may cause one-sided swelling, pain, warmth or skin colour changes.
- Your DVT does not always cause severe pain.
- Your pelvic lymph-node removal can lead to lymphoedema in one or both legs.
- Your lymph-node surgery can also occasionally cause a lymphocele.
- Your prescribed blood-thinning injections help reduce your postoperative clot risk.
- You should not stop prescribed anticoagulant injections without medical advice.
- Your persistent lymphoedema may benefit from specialist assessment and compression treatment.
- You should call 999 if leg swelling occurs with chest pain or significant breathing difficulty.
Frequently Asked Questions
1. Is leg swelling normal after robotic prostate surgery?
Some swelling can occur after surgery, particularly if pelvic lymph nodes were removed. However, new, worsening or one-sided swelling should be assessed by your clinical team.
2. Why can surgery increase the risk of a blood clot?
Recent surgery, cancer and reduced mobility can increase your risk of developing a deep vein thrombosis (DVT). Early movement and prescribed blood-thinning treatment can help reduce this risk when appropriate.
3. What are the symptoms of a DVT?
A DVT may cause swelling, pain, tenderness, warmth or skin colour changes, usually affecting one leg. New or unexplained symptoms after surgery should be assessed promptly.
4. Can you have a DVT without severe pain?
Yes. DVT symptoms can vary, and you may not experience severe pain. Unexpected swelling in one leg should be medically assessed even if your pain is mild or absent.
5. Can lymph-node removal cause leg swelling?
Yes. Removing pelvic lymph nodes can affect lymph drainage and cause swelling in one or both legs. This is known as lymphoedema.
6. What does lymphoedema feel like?
Your affected leg may feel swollen, heavy, tight or achy. The swelling can fluctuate during the day and may become more noticeable after prolonged standing.
7. Can lymphoedema develop months after surgery?
Yes. Lymphoedema can develop later in your recovery, so new or increasing leg swelling should still be assessed even if your surgery was several weeks or months ago.
8. How is lymphoedema treated?
Treatment may include compression garments, exercise, skin care and techniques to improve lymph drainage. Your healthcare team should assess the swelling before you begin compression treatment yourself.
9. When should you contact your surgical team about leg swelling?
You should contact your clinical team promptly if swelling is new, increasing or clearly greater in one leg, particularly if you also have pain, warmth, tenderness or skin colour changes.
10. When is leg swelling an emergency?
Seek emergency medical attention if leg swelling occurs with severe breathlessness, chest or upper-back pain, a very fast heartbeat or collapse. These symptoms can indicate a pulmonary embolism and require immediate treatment.
Final Thoughts: Leg Swelling After Robotic Prostate Surgery
Leg swelling after robotic prostate surgery can have several causes, including temporary postoperative changes, lymphoedema after pelvic lymph-node removal or, less commonly, a deep vein thrombosis. New, increasing or mainly one-sided swelling should be assessed, especially if it occurs with calf or thigh pain, warmth, tenderness or changes in skin colour. Chest pain, severe breathlessness, fainting or collapse requires emergency medical help.
If you are recovering from surgery and develop concerning swelling, contact your surgical team or seek urgent medical assessment as appropriate. If you are considering robotic prostate surgery in London, contact us at Prostate Clinic London to discuss the procedure, expected recovery and postoperative care.
References
- Cambridge University Hospitals NHS Foundation Trust (2024) Reducing the risk of developing lymphoedema. Approved 16 September 2024. Available at: https://www.cuh.nhs.uk/patient-information/reducing-the-risk-of-developing-lymphoedema/
- Carlsson, S., Bottai, M., Lantz, A., Bjartell, A., Hugosson, J., Steineck, G., Stranne, J., Wiklund, P., Haglind, E. and Akre, O. (2022) ‘Lymph swelling after radical prostatectomy and pelvic lymph node dissection’, BJU International, 129(6), pp. 695–698. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC9313832/
- Gloucestershire Hospitals NHS Foundation Trust (no date) Deep vein thrombosis (DVT). Review due February 2028. Available at: https://www.gloshospitals.nhs.uk/your-visit/patient-information-leaflets/deep-vein-thrombosis-dvt/
- National Institute for Health and Care Excellence (2018) Venous thromboembolism in over 16s: reducing the risk of hospital-acquired deep vein thrombosis or pulmonary embolism. NICE guideline NG89. Last updated 13 August 2019 and last reviewed 18 September 2024. Available at: https://www.nice.org.uk/guidance/ng89
- NHS (2026) Swollen ankles, feet and legs (oedema). Page last reviewed 26 February 2026. Available at: https://www.nhs.uk/conditions/oedema/
- Prostate Cancer UK (2024) Surgery: radical prostatectomy. Updated July 2024. Available at: https://prostatecanceruk.org/prostate-information-and-support/treatments/surgery
- Prostate Cancer UK (2025) Managing symptoms in advanced prostate cancer. Updated September 2025. Available at: https://prostatecanceruk.org/prostate-information-and-support/advanced-prostate-cancer/managing-symptoms-in-advanced-prostate-cancer
- Su, S., Wang, J., Lei, Y., Yi, T., Kang, H., Bai, B. and Wang, D. (2024) ‘The efficacy of peritoneal flap fixation on symptomatic lymphocele formation following robotic-assisted laparoscopic radical prostatectomy with pelvic lymph node dissection: a systematic review and meta-analysis’, International Journal of Surgery, 110(2), pp. 1172–1182. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC10871587/
- University College London Hospitals NHS Foundation Trust (2026) Reducing the risk of lymphoedema in your foot, leg and genital area. Page last updated 4 June 2026. Available at: https://www.uclh.nhs.uk/patients-and-visitors/patient-information-pages/reducing-risk-lymphoedema-lower-limb-genital-area
- University College London Hospitals NHS Foundation Trust (2026) Robotic prostatectomy. Page last updated 4 March 2026. Available at: https://www.uclh.nhs.uk/patients-and-visitors/patient-information-pages/robotic-prostatectomy