Several studies have stated that rates of premature mortality of schiz
ophrenic patients are increased. Morbidity, however, is less often exa
mined. In the present study we have compared the number of hospitaliza
tions due to different somatic diseases in 775 schizophrenic patients
with their sex- and age-matched controls. The total number of patients
hospitalized due to somatic diseases was significantly greater among
the schizophrenics than among the controls. In the former group, 523 o
ut of 775 and in the latter 373 out of 775 had been admitted at least
once during a 15 y period. If the schizophrenic patients who also had
been diagnosed as substance abusers at least once were excluded from t
he analysis there was still a significant difference between the remai
ning patients and their controls. The patients exhibited an over-morbi
dity in almost all diagnostic groups, the most prominent excess morbid
ity appeared in the groups of injuries and symptoms, signs and ill-def
ined conditions, when compared with the controls. Even if there are co
nfounding factors which should be taken into consideration when interp
reting morbidity data, the pattern of excess morbidity among schizophr
enic patients found in this study is so definite that it cannot be con
sidered merely coincidental.