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).
