Less common causes of sudden redness and swelling in one leg include:
Gout or arthritis, where uric acid crystals or inflammation cause pain and swelling in the joints.
Injury or trauma, such as a muscle tear or sprain, which can cause swelling and discoloration.
Lymphedema, a buildup of lymphatic fluid due to blocked or damaged lymph vessels.
When to See a Doctor
Because many of these conditions—especially DVT and cellulitis—can become dangerous if untreated, it is important not to ignore sudden swelling and redness in one leg. You should seek medical care immediately if:
The swelling appeared suddenly.
The leg is painful, warm, or tender to the touch.
You have a fever or chills.
You experience chest pain, dizziness, or shortness of breath (signs of a blood clot in the lungs).
Conclusion
A leg that suddenly becomes red and swollen should never be dismissed as something minor. It may be a sign of a serious problem such as DVT or cellulitis, both of which require urgent treatment. If you or someone you know develops these symptoms, do not delay—contact a healthcare professional right away. Acting quickly could save your life.
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