History and Objectives: Due to high rate of involuntary urination in pregnancy and hygienic and social stigma associated with it and due to various reports on its prevalence, the present study was carried out in order to determine the rate of involuntary urination in Shabihkhani hospital in the last 3 months of 1997.

Materials and Methods: A descriptive study with probable 50% rate of prevalence was carried on 400 women with first and second pregnancy. Personal records and situation of involuntary urination, start time, severity of the urination and treatment was recorded. Prevalence and confidence of interval was determined.

Results: Mean age was 23±4.3 years and 40% of the patients were first time pregnant and 60% were second time pregnant. Prevalence of involuntary urination was 33.5% and most patients were involved in the 3rd trimester of their pregnancy.

Conclusion: Due to the high rate of involuntary urination and social and economic side effects, it is suggested that analytical study ought to be conducted in order to determine the causes of the disease and find the way to reduce the rate. Educational programs for pregnant mothers ought to be carried out.