It is not surprising that thyroid diseases are common in woman that men, because this can be attributed to the hormonal differences between the both. The females folks are highly predisposed to thyroid diseases due to changes they go through after pregnancy and after menstruation.
Basically, insufficient production of thyroid hormone known as thyroxine by the thyroid gland, leads to the condition called hypothyroidism. This condition is accomopanied by symptoms such as, fatigue, weight gain or loss, infertility, constipation, etc.
Generally, hypothyroidism often occurs due to autoimmune disease called Hishimoto, whereby the thyroid gland is unable to secrete enough thyroxine needed for the normal body functioning.
As for the female's hypothyroidism, the fluctuation of this thyroxine after conception and menstruation make them susceptible to thyroid diseases.