Classification of phlebitides is difficult and none of the suggestions
made so far has been internationally recognized. Already the definiti
on of ''primary'' and ''secondary'' presents difficulties. For practic
al purposes the phlebitides are classified in this survey according to
their importance as disease entities and their etiology. The role of
phlebitis saltans as an idiopathic disease or as an indicator of under
lying disorders is emphasized and the differential diagnosis between s
ymptomatic skipping phlebitis and paraneoplastic thrombosis with secon
dary inflammation is outlined.