Can docs explain what does loss of lordosis mean?

Loss of lordosis: Is straightening of either the lumbar or cervical spine. Lordotic curvature is part of the normal s curvature of the spine. When you have a loss of this curvature, you have straitening in the area. This can be normal for an individual, can be a sign of bad posture, or be caused by something like a muscle spasm. This does not allow for the same protective spring action the s curve provides.