“Hypothyroidism (underactive thyroid) is a condition in which your thyroid gland doesn’t produce enough of certain important hormones.  Women, especially those older than age 60, are more likely to have hypothyroidism.  It upsets normal balance of chemical reactions in your body.  Unlikely symptoms in the early stages, but over time, untreated it can cause a number of health problems, such as obesity, joint pain, infertility and heart disease.”

MAYO Clinic