When a major instigator of feline lymphomas was the feline leukemia and the feline aids viruses, the lymphomas tended to spring up in multiple locations outside of the digestive tract ( multi-centric ). They still do, but not in the quantity that they once did. They now tend to occur in the cat’s digestive ( alimentary ) tract and the organs that adjoin it ( pancreas, liver and gall bladder ) - particularly in older cats. Many of the lymphomas that occur in the alimentary tract are quite treatable. You can read more about these tumors and their treatment here , here and here .
I had never even heard of Essiac before this happened with my cat, and the vet actually just gave her FlorEssence, which is what we gave her the rest of the time we treated her. I had never known of the kidney warnings for Essiac until I stumbled here, so was just curious at what FlorEssence has ingredients wise and it does have 'organic sheep sorrel herb'. Not sure if that is the same version of sorrel that can cause issues, but possibly the detox mixture of other herbs in FlorEssence also helped ease any burden the kidneys may bear?