leptin resistance, inflammation, dieting, nutrient deficiencies such as low iron, selenium, zinc, chromium, Vitamin B6 and B12, Vitamin D, iodine, low testosterone, low human growth hormone, insulin dependent diabetes, pain, environmental toxins, free radical load, hemorrhagic shock, liver disease and kidney disease.
Your Free T3 to Reverse T3 ratio is only 1.4, so that is lower than recommended levels of about 1.8 minimum.