WATCH: Clinton's Constant Throat Clearing

Observers of Hillary Clinton over the past six months or so will have noticed an incessant coughing and clearing of her throat that has plagued the former first lady across that time frame.

During her headline speech on Thursday at the Democratic National Convention in Philadelphia, Clinton noticeably cleared her throat twenty-two times. In and of itself, it could be written off as temporarily being under the weather. Given its persistence, however, questions arise about the Democrats' presidential nominee. She seemed to have deliberately timed her throat clearing during manufactured applause directed by her audience managers.

Watch a montage of Clinton's throat troubles below.

Clinton suffered a concussion late in 2012. Philippe Reines, a Clinton loyalist who operated as deputy assistant secretary of state said she had fainted after being dehydrated due to a stomach virus. For some time afterwards, she occasionally wore special "Fresnel prism" lenses for treating double vision after a brain injury.

Secretary of State Hillary Rodham Clinton testifies on Capitol Hill in Washington, Wednesday, Jan. 23, 2013, before the Senate Foreign Relations Committee hearing on the deadly September attack on the U.S. diplomatic mission in Benghazi, Libya, that killed Ambassador Chris Stevens and three other Americans. She is wearing 'Fresnel prism' glasses designed to treat double vision following a brain injury. (AP Photo/J. Scott Applewhite)

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