Localized erythema, swelling, and pain/tenderness along vein
+/- palpable, indurated venous cord
+/- fever
Phlebitis
Superficial thrombophlebitis due to VTE, chronic venous stasis
Lymphangitis
Trauma from peripheral venous access 
Deep venous thrombosis
Medication infusion related
Colitis
e.g. Aztreonam, vancomycin, phenytoin, amiodarone, dobutamine, concentrated potassium,