internal and external injuries in damp-heat lumbago

If internal damage cause damp-heat, then Siwu Tang (四物湯) cannot be avoided. 

Because damp-heat injures blood.

If an internal injury cause damp-heat, one cannot lie down or stand up immediately.

"If damp-heat is caused by external conditions, the entire face will be red and swollen, and the condition will worsen on cloudy days. In this case, Danggui Niantong Tang (當歸拈痛湯) is used."