2 Jin of sand, 2 Liang of dried pepper, 2 Liang of pepper, 2 Liang of ginger slices and half a catty of coarse salt, mixed together, fried in a pot and put in a cloth bag; The patient lies in bed, wraps the cloth bag with a towel and puts it on his waist for hot compress. Pay attention to the thickness to ensure that the lumbar spine will not bend when sleeping in bed, so as not to deepen. The cloth bag should not be too hot,