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Sudden swelling in only one leg deserves more attention than symmetrical mild swelling in both ankles.
Symptoms that can occur with a **deep vein thrombosis (DVT)** include:
* One-sided leg swelling
* Calf or thigh pain
* Warmth
* Red or discolored skin
* Tenderness
Not everyone with a DVT has obvious symptoms, and you cannot diagnose one simply by looking at the veins.
A suspected DVT needs prompt medical assessment.
## 7. Sudden Prominent Veins With Chest Pain or Shortness of Breath
This is an emergency situation.
If leg swelling or suspected clot symptoms are followed by:
* Sudden shortness of breath
* Chest pain
* Rapid heartbeat
* Fainting
* Coughing up blood
seek emergency medical care immediately.
These symptoms can occur when a blood clot travels to the lungs, causing a pulmonary embolism.
## 8. Veins Appear With Significant Skin Color Changes
Visible veins accompanied by skin that becomes:
* Blue
* Purple
* Very pale
* Dark red
may indicate a circulation problem, especially when combined with pain, swelling, coldness, or numbness.
This does not always mean a dangerous condition, but sudden color changes should not be ignored.
## 9. Bulging, Twisted Veins in the Legs
