Why is my lower back curved instead of straight?

The clinical significance of an “unstraight” lumbar spine with a curved appearance differs between anteroposterior (AP) and lateral radiographs. Scoliosis is typically identified on AP X-rays, whereas degenerative lumbar spine disease and lumbar muscle fatigue are more commonly detected on lateral X-rays. The implications of an “unstraight” lumbar spine with curvature are as follows:

1. Anteroposterior (AP) view: In healthy individuals, the lumbar spine appears straight on an AP X-ray. If curvature is observed on the AP view, the corresponding scoliotic Cobb angle should be measured. A curvature less than 10° indicates mild scoliosis, which falls within the normal physiological range and generally requires no specific intervention. However, if the lumbar scoliotic angle exceeds 10°, a diagnosis of scoliosis can be established.

2. Lateral view: The lumbar spine normally exhibits a gentle anterior curvature (lordosis) when viewed from the side. Consequently, individuals may perceive a “hollow” sensation in the lower back when lying supine, and the palm may comfortably fit into this space—this is usually considered normal. Nevertheless, degenerative lumbar spine changes or lumbar muscle fatigue cannot be entirely ruled out.

Maintain regular daily routines, avoid frequent late-night activity, and ensure adequate sleep. Diet should emphasize light, easily digestible foods; minimize intake of greasy or spicy, irritating foods.