What are symptoms of kidney poisoning?

It depends. This depends on what you mean by poisoning. If you mean renal failure, this has symptoms like high BUN and creatinine (azotemia), hematuria, proteinuria, and dehydration or edema depending on the type of renal failure. If prerenal (beforethe kidney), bun/cr ratio is >20:1, renal <10-15:1, and postrenal has a high BUN of 150 if advanced. Causes like sle, strep., etc. Have unique signs (eg c3c).