What to do: See a vascular specialist. Early treatment can prevent progression.

3. Deep Vein Thrombosis (DVT)

What it is: A blood clot in a deep vein, usually in the leg. This is a medical emergency.

Symptoms:

  • Sudden swelling in one leg

  • Pain or tenderness (often described as cramping)

  • Warmth over the affected area

  • Red or discolored skin

  • Visible surface veins may become more prominent as the body tries to reroute blood

When to worry: IMMEDIATELY
DVT requires emergency medical attention. If the clot travels to the lungs (pulmonary embolism), it can be fatal.

Seek emergency care if:

  • You have sudden, severe swelling in one leg

  • You have chest pain or difficulty breathing

  • You cough up blood

  • You feel lightheaded or faint

What to do: Call emergency services or go to the ER immediately.

4. Superficial Thrombophlebitis

What it is: Inflammation of a vein just under the skin, usually with a small clot.

Symptoms:

  • A hard, cord-like vein

  • Redness and warmth along the vein

  • Tenderness or pain

  • Swelling in the area

When to worry:

  • If redness spreads

  • If you develop fever

  • If it occurs in multiple places

  • If you have risk factors for DVT