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Hashimotos is an autoimmune/autoinflammatory disorder of the thyroid gland. This may be why your CRP is so high. On the other hand, multiple autoimmune conditions tend to co-exist in some individuals. You may have an autoimmune process damaging your kidneys. When this happens, the kidneys begin to slowly fail and creatinine builds up in the bloodstream. There is often protein spilling into the urine as well. These are indications that you need to see a kidney specialist (nephrologis) if you haven't already.