Although men and women share many of the symptoms of hyperthyroidism, there are several important complications that affect men specifically. In particular, an overactive thyroid gland can contribute to the development of erectile dysfunction, as well as a low sperm count in the seminal fluid. Also, premature baldness can be a sign of hyperthyroidism in men. Too much thyroid hormone can also cause lower testosterone levels, which can lead to several complications. For example, men may also be more significantly affected by muscle loss caused by hyperthyroidism. Osteoporosis caused by an overactive thyroid gland can appear in men surprisingly, since this characteristic of the disease – thinning of the bones – most often occurs in women. A condition known as gynecomastia (enlarged breasts in men) can also result from hyperthyroidism. There are symptoms of hyperthyroidism that are related to specific male sexual health. According to studies, thyroid hormones affect the function of certain cells in the testicles. For example, too much or too little thyroid hormone can affect the healthy function of Leydig cells, which help produce and secrete testosterone. Hyperthyroidism also affects sperm, resulting in decreased and poor sperm motility (the ability of sperm to move or “swim”). It can even affect the normal condition or shape of the sperm themselves. Thyroid disease is associated with erectile dysfunction, although the relationship between the two conditions is not yet fully understood. Both overactive and underactive thyroids can affect erectile function, although hypothyroidism is more commonly associated with erectile dysfunction. All these disorders can lead to infertility. If the sperm count is low, a thyroid hormone test should be done. This test can help diagnose the problem and treat it by balancing hormone levels, which in turn can help improve the patient’s sexual health. Bibliography: National Institute of Diabetes and Digestive and Kidney Diseases. Hyperthyroidism. Healthline. Hyperthyroidism in Men: What You Need to Know