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Your doctor looks for redness, warmth, swelling and tenderness in the affected vein and in the surrounding skin. The clotted and inflamed vein also can be very firm and can feel like a hard line or string under the skin.

Your doctor usually can diagnose thrombophlebitis with a simple physical examination. In people with many episodes of thrombophlebitis, or with thrombophlebitis involving more than one vein, further tests may be necessary to check for problems with blood flow in the veins.

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