5 Health Conditions That Can Cause Visible Veins — And When to Worry

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  • Genetics
  • Obesity
  • Pregnancy
  • Prolonged sitting or standing

Note: While not always dangerous, varicose veins can progress to CVI or DVT if ignored.

3. Deep Vein Thrombosis (DVT)

What it is:
A life-threatening condition where a blood clot forms in a deep vein, usually in the leg or thigh. While the clot itself isn’t visible, it can cause surface veins to become more prominent due to blocked blood flow and swelling.

Warning signs:

  • Sudden swelling in one leg (not both)
  • Pain or tenderness, often starting in the calf
  • Warmth and redness over the affected area
  • Visible, engorged veins