The short explanation
Please get urgent medical help now. A swollen, warm, painful calf can be a sign of a deep vein thrombosis, a blood clot in the leg, and breathlessness can mean a clot has travelled to the lungs, called a pulmonary embolism. This is a medical emergency. The combined pill slightly increases the risk of blood clots, and although this is uncommon, these symptoms must be checked straight away. Call 112 or go to the nearest emergency department. Doctors will usually do blood tests and a scan of the leg or chest. If a clot is found, treatment is very effective when started early.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Do not drive yourself if you feel breathless or faint; ask someone to take you or call an ambulance.
- Take your pill pack with you to show the doctor.
- Other factors that increase clot risk include recent surgery, long travel, smoking, being overweight and family history of clots.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell whether you have a clot. Urgent examination and tests are needed.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Could I have a blood clot?
- What tests do I need now?
- Should I stop the pill?
- What contraception can I use safely in future?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 or go to the nearest emergency department now for leg swelling and pain with breathlessness, chest pain or coughing blood.
Get help the same day
- Get care the same day, within hours, even if you only have a painful swollen leg without breathlessness.
Sources
The evidence this explanation is built on.
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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