My wife is recovering from a stem cell transplant treatment for multiple myeloma. Her own stem cells, extracted 5 years ago, were used. Melphalan (sp?) dose was given on July 16, stem cells put in on July 18. We are now 14 days out from the transplant and her blood tests for the typical things related to this transplant are looking good. She has been troubled with chills and fevers for which there is no apparent cause - all tests for infections have been negative. Even before the transplant process she had issues with being too cold or too hot, especially in early morning hours. I m just thinking of other causes for erratic chills/fevers- and I was wondering if a thyroid problem should be considered?