Lordosis can cause pain that sometimes affects the ability to move. It is usually found in the lower back, where the inward curve can make the buttocks seem more prominent.
When lying on the back on a hard surface, someone with a large degree of lordosis will have a space beneath the lower back and the surface. If the curve is flexible (or reverses itself when the person bends forward), there is little need for medical concern. If the curve does not change when the person bends forward, the lordosis is fixed, and treatment may be needed.