Pregnancy is characterized by several changes in a women's body. These changes contribute to the emergence of Low Back Pain (LBP), which may influence the daily activities during pregnancy. Pain of any origin comprises an individual's life. Majority of women are affected in their first pregnancy. Eight percent activities of daily routine are affected and 10% of patients who are unable to return to work because of LBP. A descriptive co-relational study design was adopted with 100 primi antenatal mothers from the selected antenatal clinics in Mangaluru who were selected using purposive sampling technique. Data was collected by using baseline proforma numerical pain rating scale and checklist on body posture. Mean and standard deviation of maintenance of body posture was 10.76 ± 3.09. Mean and standard deviation of pain is 3.54±2.58. There is a positive correlation (78.92) between back pain and body posture. The findings of the study proved that there was a positive relationship between back pain and body posture. Maintenance of body posture is useful in relieving back pain in antenatal mothers.