There are two possibilities for this situation: one may be a sprained lumbar muscle, a previous injury, or a current injury, with blood stasis in the waist and impassability of meridians.

In addition, there is likely to be lumbar disc herniation. The typical symptom of this disease is backache when moving things. You can take some Yaoxitong capsules, which have a good effect on these diseases, and you can achieve the effect after taking it for a while.