Everyone’s spine curves a little in your neck, upper back, and lower back. These curves, which create your spine’s S shape, are called the lordotic (neck and lower back) and kyphotic (upper back). Lordosis refers to your natural lordotic curve, which is normal.
J Formos Med Assoc. Mar;91(3) Lumbar lordosis: normal adults. Lin RM(1), Jou IM, Yu CY. Author information: (1)Department of Orthopedics.
An overview of degenerative scoliosis and adult spinal deformity, diagnosis and spine arches slightly inward toward the jaw in a curvature called lordosis.