We diagnosed thyrotoxicosis (Tx) and chronic lymphoproliferative disease (L
PD) in nine cases; seven had chronic lymphocytic leukemia (CLL), one had ha
iry cell leukemia (HCL) and one had non-Hodgkin's lymphoma (NHL). In a lite
rature review, we found only one reported case with Tx and CLL and document
ation of an higher incidence of Tx in the relatives of CLL patients. We rep
ort these nine cares here and discuss this interesting association.