It's normal lordotic curve, which is normal. But if curve too deeply inward, it’s called lordosis, or swayback. Lordosis can affect your lower back and neck. It's by many causes like weakness or tightness of muscles, achondroplasia, spondylolistesis, osteoporosis, obesity, kyphosis or inflammation of the spine. First of all you need to assess the cause and how much it's. Treatment of lordosis depends on how much going inward the curve is and how you got lordosis.
So first of all diagnose the factor and how much it's.
Next Steps
Consult to orthopaedician or physiotherapist.
Health Tips
Doing exercises like cat pose to stretch the lower back spine, child pose, lung pose, muscles stretching exercises, plank exercise, and maintain ppsture. And use spinal brace also to stop the curvature of spine.