Final answer:
An excessive curvature in the lumbar region is not scoliosis, but lordosis. It is caused by various factors such as poor posture or obesity.
Step-by-step explanation:
An excessive curvature in the lumbar region of the vertebral column is actually not scoliosis, but a condition known as lordosis. In scoliosis, there is an abnormal sideways curvature of the spine, while in lordosis, there is an exaggerated inward curvature in the lower back. This can be caused by various factors, such as poor posture, obesity, or certain health conditions.
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