## If You Notice Your Legs Are Swollen, It Could Be a Sign of… Swollen legs (**edema**) can have many causes, and **swelling alone does not mean you have cancer**. Common causes include prolonged standing, hot weather, certain medications, vein problems, and fluid retention. However, persistent or unexplained swelling deserves attention because it can sometimes be associated with medical conditions such as: – **Heart problems** — especially when swelling affects both legs and occurs with breathlessness or unusual fatigue. – **Kidney disease** — impaired fluid regulation can cause swelling. – **Liver disease** — advanced liver disease can contribute to fluid accumulation. – **Chronic venous insufficiency** — blood pools in the legs when veins don’t return blood efficiently. – **Lymphedema** — impaired lymphatic drainage can cause persistent swelling. – **A blood clot (DVT)** — more typically causes **sudden swelling in one leg**, often with pain, warmth, or redness. ### What about cancer? Some cancers and cancer treatments can cause swelling, particularly when a tumor or treatment affects lymphatic drainage. But **swollen legs by themselves are not a reliable sign of cancer**. ### 🚨 Seek urgent care if One leg suddenly becomes swollen, painful, warm, or red, or if leg swelling is accompanied by **sudden shortness of breath, chest pain, coughing up blood, fainting, or severe dizziness**. If swelling persists or keeps returning, a healthcare professional can determine the cause rather than relying on the symptom alone.