Deep Vein Thrombosis Explained
Know the deep vein thrombosis, symptoms, causes, and diagnosis. Learn about the prevention, management, and its influence on health.
Written by Dr. Dhankecha Mayank Dineshbhai
Reviewed by Dr. M L Ezhilarasan MBBS
Last updated on 13th Jan, 2026
Deep Vein Thrombosis Explained
Introduction
Deep Vein Thrombosis (DVT) is a serious but manageable condition that affects many people. If you or someone you know has been diagnosed with DVT or is at risk, understanding what it is, how it happens, and what you can do about it can make a big difference in staying healthy.
What Is Deep Vein Thrombosis (DVT)?
Deep Vein Thrombosis occurs when a blood clot forms in one of the deep veins in your body, usually in the legs. These clots can block blood flow, causing pain and swelling. In some cases, a piece of the clot can break off and travel to the lungs, leading to a life-threatening condition called pulmonary embolism (PE).
Consult a Top haematologist for the best advice
Symptoms of DVT
Not everyone with DVT experiences symptoms, but common signs include:
- Swelling in the affected leg (rarely both legs)
- Pain or tenderness, often starting in the calf
- Warmth and redness over the area
- Heaviness or cramping in the leg
If you notice sudden shortness of breath, chest pain, or coughing up blood, seek emergency medical help immediately—these could be signs of a pulmonary embolism.
What Causes DVT?
Blood clots form when blood flow slows down or becomes stagnant. Several factors increase the risk of DVT:
- Prolonged Immobility – Sitting for long hours (e.g., long flights, bed rest after surgery)
- Injury or Surgery – Damage to veins can trigger clotting
- Medical Conditions – Cancer, heart disease, or inherited blood disorders
- Hormonal Changes – Pregnancy, birth control pills, or hormone therapy
- Obesity – Extra weight puts pressure on the veins
- Smoking Affects blood circulation
- Age – Risk increases after 60, but DVT can happen at any age
How Does DVT Affect Your Health?
If left untreated, DVT can lead to:
- Pulmonary Embolism (PE) – A clot travels to the lungs, blocking blood flow (a medical emergency).
- Post-Thrombotic Syndrome – Long-term pain, swelling, and skin changes due to damaged veins.
- Chronic Venous Insufficiency – Poor blood flow can cause leg ulcers.
By adopting early diagnosis and treatment, most complications can be prevented.
How Is DVT Diagnosed?
If your doctor suspects DVT, they may recommend:
- Ultrasound – The most common test to detect clots in veins.
- D-Dimer Blood Test – Checks for substances released when a clot dissolves.
- Venography or MRI – Used in rare cases for more detailed imaging.
Treatment and Management of DVT
Treatment focuses on preventing clots from growing, stopping new clots from forming, and reducing complications.
1. Medications
Blood Thinners (Anticoagulants) – Such as warfarin, heparin, or newer drugs like rivaroxaban. These prevent clots but do not dissolve existing ones.
Thrombolytics – Used in severe cases to break up clots quickly.
2. Compression Stockings
Wearing special stockings helps improve blood flow and reduce swelling.
3. Lifestyle Changes
- Stay Active – Avoid sitting for long periods; take short walks regularly.
- Hydrate Well – Drinking water keeps blood from thickening.
- Elevate Your Legs – Helps reduce swelling.
- Quit Smoking – Improves circulation.
- Maintain a Healthy Weight – Reduces pressure on veins.
4. Prevention During Travel or Immobility
- Move your legs frequently (flex ankles, stretch).
- Wear compression stockings if at high risk.
- Stay hydrated and avoid alcohol.
When to See a Doctor
If you experience leg pain, swelling, or any symptoms of DVT, consult a doctor immediately. Early treatment can prevent serious complications.
Final Thoughts
Deep Vein Thrombosis is a serious condition, but with awareness and timely action, it can be managed effectively. If you’re at risk, take preventive steps, stay active, and seek medical advice if you notice any warning signs. Your health is in your hands—stay informed and stay safe!
Consult a Top haematologist for the best advice
Consult a Top haematologist for the best advice
Dr. Purvi Kadakia Kutty
Paediatric Haematologist
10 Years • MD Paediatrics FNB Pediatric Haem. & Onco.
Mumbai
Apollo Hospitals CBD Belapur, Mumbai
Dr Abilash Jain
General Physician/ Internal Medicine Specialist
12 Years • MBBS,DNB(FM),MNAMS,FIAMS,CCGMG(GERIATRICS),DGM (GERIATRICS),PGCD(DIABETES,BOSTON UNIVERSITY),FID(DIABETICS UK)CCEPC(PALLIATIVE CARE),CCCC(CRITICAL CARE)
Visakhapatnam
Apollo Clinic Vizag, Visakhapatnam
(25+ Patients)
Dr. Thorana Prakash M
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr Vijeya Lakshmi Chakravarthy
General Physician
3 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Darshan R S
Medical Oncologist
3 Years • MBBS, MD General Medicine, DM Medical Oncology
Bengaluru
Apollo Hospitals Bannerghatta Road, Bengaluru
Consult a Top haematologist for the best advice
Dr. Purvi Kadakia Kutty
Paediatric Haematologist
10 Years • MD Paediatrics FNB Pediatric Haem. & Onco.
Mumbai
Apollo Hospitals CBD Belapur, Mumbai
Dr Abilash Jain
General Physician/ Internal Medicine Specialist
12 Years • MBBS,DNB(FM),MNAMS,FIAMS,CCGMG(GERIATRICS),DGM (GERIATRICS),PGCD(DIABETES,BOSTON UNIVERSITY),FID(DIABETICS UK)CCEPC(PALLIATIVE CARE),CCCC(CRITICAL CARE)
Visakhapatnam
Apollo Clinic Vizag, Visakhapatnam
(25+ Patients)
Dr. Thorana Prakash M
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr Vijeya Lakshmi Chakravarthy
General Physician
3 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Darshan R S
Medical Oncologist
3 Years • MBBS, MD General Medicine, DM Medical Oncology
Bengaluru
Apollo Hospitals Bannerghatta Road, Bengaluru