Chronic illness is systemic. It is best addressed systemically. This means multiple organs and likely multiple agents, pathogens and toxins need attention simultaneously.
In addition, the body prioritizes what it contends with, and any organ or agent will need to be addressed accordingly. If an organ is stressed with a particular agent, that will be accounted for in the particular order the remedies are to be administered. By clearing the terrain chronic illness is best addressed to promote recovery.