BACKGROUND: Lower back pain is very common in nursing staff because nursing staffs are engaged in several job duties like, patient manual handling, transferring and turning patient, holding equipment for longer duration in operation theatre, prolong standing, bending carrying patients, and torso twisting, working on weekends also play a role. If the person is obese, further load is increased on lumbar spine specially while working with poor posture and ergonomics. METHOD: Total 120 nurses were included in this study among them 114 were female and 6 were male. Height and weight were recorded. Examiner evaluated lumbar lordosis angle in standing position with flexible curve and θ angle calculated. Intensity of low back pain was measure with NPRS scale. For the statistical analysis SPSS software were used. RESULT: Mean angle of lumbar lordosis in nurses was 52.12 degree. However, nurses with pre obesity had higher back pain than under weight. There was a significant association found between BMI and lumbar lordosis (P value < 0.001) and BMI with back pain (P value 0.04). CONCLUSION: The significant difference was found between BMI and lumbar lordosis in present study. The study also found significant association between pre obesity group and low back pain. The significant difference was also found between age, BMI and lumbar lordosis in nurses.