One Swollen Calf Is Not Just a Sore Leg

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A sore leg after gardening, a long walk, or a day on your feet is hardly unusual. But if one calf suddenly becomes swollen, painful, warmer than the other, or changes colour, it is worth treating the difference seriously rather than assuming you have simply overdone it.

One possible cause is deep vein thrombosis, or DVT, where a blood clot forms in a deep vein, usually in the leg. Healthify NZ lists swelling, pain, skin colour changes, and warmth over the affected area among the possible signs. The discomfort can sometimes feel like a persistent cramp or soreness.

That does not mean every swollen calf is a blood clot. A muscle injury, joint problem, infection, or conditions affecting the veins can cause similar symptoms. In fact, Healthify notes that DVT symptoms can sometimes be confused with an ordinary injury, which is one reason a new and unexplained change should not simply be ignored.

Pay particular attention if the swelling is mainly on one side and appeared without an obvious explanation. It is also useful to mention recent circumstances to your healthcare provider, such as a long period of immobility, surgery, an injury, or previous blood clot, as these can be relevant when assessing leg symptoms.

If you notice possible DVT symptoms, contact your healthcare provider urgently rather than waiting several days to see whether they disappear. And if leg pain or swelling occurs alongside breathlessness, chest pain, coughing up blood, or fainting, seek immediate medical help. These can indicate that a clot has travelled to the lungs.

The useful habit here is simple: notice changes between your two legs. You do not need to diagnose the cause yourself. A sudden difference that cannot be explained by an obvious knock or strain is enough reason to ask for medical advice.