underactive thyroid
"With both parents hypothyroid, I was diagnosed hypothyroid at 7 years old, so have 50  years of personal experience with thyroid medicines.  Armour Thyroid is absolutely the best in my opinion. Doctors tried to "fool my body" with assorted synthetic products, but my system (& Mom's) did not do the T3-T4 conversion.  On top of the usual problems of being functionally underdosed I developed worse results:  thrombocytopenia (critically low platelets), high cholesterol, inability to metabolize calcium leading to lower bone density than my own mother.  On Synthroid one Internal Medicine doctor even wondered if I had Hashimoto's Disease.  Use Armour.  Treat the patient."