What Problems Occur From Low Levels of T3 & T4 Hormones?
The hormones T3 (triiodothyronine) and T4 (thyroxine) are produced by the thyroid gland. The thyroid gland is located in the lower neck, in front of the windpipe. It is part of the endocrine system, the system that regulates urine production, puberty, growth, energy levels and stress responses in the body. When levels of T3 and T4 are low, the body may be experiencing primary hypothyroidism or central hypothyroidism.