General information, not an individual diagnosis. Ask a healthcare professional if you are unsure about your situation.
A leg that suddenly swells or becomes very painful needs prompt medical advice. In France, call 15 or 112 for difficulty breathing, sudden chest pain, faintness or coughing up blood.
Remaining still for a long time during a journey can favour venous thrombosis, a blood clot in a vein. This risk applies to travel by plane, car or train when the legs move little.
If you have previously had venous thrombosis or a pulmonary embolism, consult your doctor before departure. Also mention recent surgery and your medicines so the doctor can assess your risk and suitable prevention.
Do not choose venous compression for a journey on your own. When it is indicated, the doctor checks contraindications and prescribes the compression level and type of product appropriate to your situation.
For prescribed compression, the pharmacist takes measurements, including at the ankle and calf, to select the size. The product must fit your legs correctly and must not be altered yourself.
On a plane, move your feet and ankles and walk regularly when possible. Also plan opportunities to move during a long car journey. These actions complement medical precautions and any prescription.
Sources
- Assurance Maladie - prévention de la phlébite et longs trajets, 18 mars 2026
- Assurance Maladie - phlébite et facteurs favorisants, 18 mars 2026
- Assurance Maladie - prescription et taille de la compression veineuse, 14 octobre 2025
- Assurance Maladie - complications veineuses nécessitant un avis rapide, 18 mars 2026
- Assurance Maladie - phlébite et signes d’urgence d’une embolie pulmonaire, 18 mars 2026
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