Your thyroid gland, which is located under the Adam’s apple area of your neck, produces two hormones. One of those hormones is called thyroxine (T4). Thyroxine is an iodine secreting hormone which regulates your metabolism.
According to the University of Maryland Medical Center, ʺT4 and T3 (triiodothyronine) hormones stimulate every tissue in the body to produce proteins and increase the amount of oxygen used by cells.ʺ
In some individuals, an increase or shortage of the hormone T4 may exist. Those with a shortage of the hormone thyroxine have hypothyroidism. Those with an excess amount of thyroxine have hyperthyroidism. These drugs will manage your hypothyroidism.
According to the American Thyroid Association and U.S. National Library of Medicine (NLM), symptoms of hypothyroidism may include:
• Feel cold
• Weight gain
• Dry skin
• Forgetfulness
• Hair loss
• Depression
• Fatigue
• Constipation
• Poor growth
Your doctor may order a T4 blood test.
https://www.empowher.com/thyroid-conditions/content/what-thyroxine