Not on me, but in many of our fellow liver flushers. I wonder if the people are either
1) dehydrated
2) had been low on oil consumption
3) under undue stress (overworked; low-energy due to feeling sick; worried about the flush itself)
Maybe everyone should be advised to try to take it easy for a day or two before a flush and reflect on whether the time is right; if the body feels right to "Go".
I think my "working up" to the flush for 4.5 days, drinking apple juice and dropping in the Chancra Piedra helped not only *chemically* but helped me make a mind-body "get ready, here we go" connection.