As thyroid hormones are important for growth, their deficiency leads to the development of medical conditions like myxoedema, cretinism and goitre. As discussed earlier, thyroid hormone is important for physical, mental, and reproductive growth of the body; therefore, decreased thyroid hormone or myxoedema manifests as:
1. Impaired sexual development
2. Infertility
3. Absent or under-developed secondary sexual characters
4. Amenorrhea or stopped menstruation
Excess thyroid hormone also leads to disorders like Grave’s disease, Myasthenia Gravis and Hashimoto’s thyroiditis. Check these links for more information about biology Concepts, Important Concepts.