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Swelling and irritation of a vein.

Phlebitis may occur with or without a blood clot. It can affect surface or deep veins. When caused by a blood clot, it's called thrombophlebitis. Injury to a vein, for instance from medical tube called a catheter, is a possible cause.

Symptoms include redness, warmth, and pain in the affected area.

Treatments may include a warm compress, compression stockings, and medicines.