The aim of this study was to determine the prevalence of depression, anxiety and phobia during pregnancy in Ahwaz. For this purpose, 360 pregnant and 60 nonpregnant women, who were referred to the public hospitals and private out-patient clinics were selected through cluster sampling. All of the subjects completed the Minnesota Multiphasic Personality Inventory (MMPI). Data were analyzed by descriptive statistics and Chi-square test. The results revealed that there were no significant differences in the first, second and third trimester pregnancy periods in terms of the incidence of depression, anxiety and phobia. Nither, there was any significant difference between the two groups of pregnant and non-pregnant women.