Objective: Regional anesthesia is preferred by most anesthetists for the majority of caesarean sections. The major advantage of regional anesthesia is the avoidance of maternal morbidity and mortality associated with general anesthesia. Aim of the study: The aim of our study was to determine the effects of spinal anesthesia on blood pressure. Patients and methods: This prospective study was carried out at Hila hospital, Imam Sadiq Hospital, Babil from January 2024 to march 2024. One hundred fifty (150) patients between (17– 45) years old were enrolled in this study. Scheduled for spinal anesthesia for caesarian section to delivery baby and different type of surgery. Statistical Analysis: Data were analyzed through the application of appropriate statistical methods by using statistical package of social sciences (SPSS) version 28 which suitable with study results, in order to analyze and evaluate the results of the present study. Demographic data are reported as mean values with SD and p. value. Discussion: In this study, it was attempted to assess and determine the blood pressure of subarachnoid block spinal anesthesia. From the results, a decision is made to reject the null hypothesis and accept the alternative hypothesis Which proves that there is a high significant or significance data variable on blood pressure 10 and 20 minutes after spinal anesthesia. This is due to the data with the higher average, as shown in the tables and graphs. Conclusion: From these results we can conclude that there are a significance data variable on effect of spinal anesthesia or subarachnoid block on blood pressure when we collected the data on four-time interval… some patients treated this drop on blood pressure as a physiological (N/S) or a pharmacological (ephedrine) vasopressor drug.  Recommendation: On the basis of the study, the following recommendations are suggested: Health educational program about how to deal with the effect of spinal anesthesia on blood pressure, ongoing researches about how to decrease the effect of spinal anesthesia on blood pressure.