It is well known that one of the first things that should be checked in a patient being treated for infertility is their thyroid function. Unfortunately, too much attention is often focused on the thyroid gland rather than the thyroid system. The possibility of decreased thyroid system function is often dismissed if thyroid hormone blood tests are normal even in the face of classic DTSF symptoms. Sometimes fertility drugs can even worsen the situation in Wilson’s Temperature Syndrome, causing initiation or worsening of the symptoms of Wilson’s Temperature Syndrome; sometimes, with the symptoms remaining persistently worse even after the fertility medicine has been discontinued. Quite a few patients I have treated have conceived easily when they had previously had difficulty getting pregnant. Of course, Wilson’s Temperature Syndrome patients often have a history of one or more miscarriages. Proper thyroid hormone treatment is sometimes necessary to enable these patients to conceive and maintain a pregnancy.