Hyperthyroidism is a term used to describe an overactive thyroid gland. The thyroid gland makes hormones that are involved in energy, metabolism and other endocrinologic functions. Men with overactive thyroid gland can experience sexual dysfunction such as premature or delayed ejaculation as well as variations in sexual drive. In these scenarios, a couple’s fertility could be affected. However, hyperthyroidism does not necessarily affect the sperm cells. Therefore, if a men with hyperthyroidism does not experience sexual dysfunction then fertility should not be affected. Furthermore, hyperthyroidism well controlled with medications should not be considered a primary risk factor for infertility. It is important to find out that the hyperthyroidism is not being caused by pituitary gland diseases. The pituitary gland, in contrast to the thyroid gland, produces key hormones involved in the health and production of sperm cells. That in turn, can be a source of infertility in males.