The vertebral column has a variable range of movements and provides a load-carrying capacity that supports physical activities during daily life. Changes in the lumbar curvature could be associated with low back pain (LBP). The aim of the present study is to evaluate the angles of the lumbar region in normal subjects (not complaining of LBP) and in patients with persistent LBP in different age groups. Lateral plain X-rays of 203 subjects were used to measure the lumbosacral angle (LSA), the body wedge angle (BWA) and the total segmental angle (TSA). The lumbosacral angle was determined as the angle between the superior endplate of the first lumbar vertebra and the superior endplate of the first sacral vertebra. It was found that normal LSA ranged between 41°- 60°. The LSA ≤40° or >60°, was considered pathological as it was usually associated with LBP. The increase or decrease in the LSA mostly affected the young age between 21-35 years and was mostly due to changes in the lower lumbar segments (L4 and L5).