There are different causes of low back pain.

But for almost all of them the symptoms are stiffness of the muscles next to the spine

And in some cases this can cause luxation or subluxation of the joint of the spine.

In these cases therapist can apply manipulation of the low part of the spine

With result unblocking the joint ending with specific sound.

And after minutes after manipulation the patient are without pain.

The manipulation should be implement by a therapist, not everyone can do this.