Final answer:
Temporary lordosis or kyphosis can be caused by pain and injuries which lead to changes in posture and spinal alignment, while stress and exhaustion can exacerbate underlying issues by affecting posture and muscle tension.
Step-by-step explanation:
Temporary lordosis or kyphosis, which are conditions related to the curvature of the spine, can be caused by several factors. Pain and injuries are two of the more common causes. Pain can lead to changes in posture as the individual attempts to avoid discomfort, resulting in an abnormal spinal curve. Injuries to the muscles or vertebrae can also lead to temporary changes in the spine's alignment. Although not traditionally considered direct causes, stress and exhaustion from daily activities can exacerbate underlying issues by affecting posture and muscle tension, potentially contributing to temporary curvature changes.