The Internet is awash with rumors about Hillary Clinton's health, but there is one medical condition she is actually known to have.
That is hypothyroidism, a condition affecting about 10 million Americans in which the thyroid is underactive, resulting in a variety of symptoms including fatigue, weakness and weight gain.
For most patients, the symptoms can be significantly reduced or eliminated with the use of hormone therapy. Clinton is being treated with a medication called Armour Thyroid, according to her doctor, who has issued a letter saying she's in "excellent" physical condition and is fit to serve as president.
Yet Armour Thyroid is a less common medication used in patients with hypothyroidism, possibly indicating Clinton wasn't responding well to the conventional treatment.