 Democratic front-runner Hillary Clinton's health was questioned after a lengthy coughing fit that abruptly interrupted her speech in Iowa recently. An audience of about 150 people had gathered at the Jewish Federation of Greater Des Moines to hear the former secretary of state's views on Israel. As she was talking about the Iran nuclear deal, the 68-year-old Clinton had to stop her speech to pop a lozenge cough drop. The Jewish Federation president David Adelman had to take over the stage while she continued to cough and reached for a glass of water to get the coughing under control and find her voice once more. In between coughs she then quickly blamed the more than a minute long coughing fit on her busy campaign schedule. 'You do talk a lot in this campaign,' Clinton then told the crowd, her voice still hoarse and raspy. This was the first of four public events in the race against Sen. Bernie Sanders to win the support of Iowa's voters. Watch the video here: It's not the first time Clinton has had one of these coughing spells. Ever since her first public coughing fit, before the House Select Committee on Benghazi on October 22, 2015, Clinton's health has been a topic of speculation. The fact that she has lozenge cough drops readily available in her pockets may be a sign that these coughing fits aren't just a one-time event. Hillary Clinton's healthcare statement In 2015, Hillary Clinton's presidential campaign released a health statement confirming hypothyroidism as well as allergies. Dr. Lisa Bardack, her physician, said she regularly takes the thyroid hormone Armour Thyroid and the anticoagulant drug Coumadin to prevent blood clots, as well as an antihistamine for seasonal pollen allergies and vitamin B12, and that she doesn't smoke and only drinks alcohol occasionally. Armor Thyroid is often given to patients with an underactive thyroid, thyroid enlargement, or to manage thyroid cancer. After taking a fall in her home in December 2012, she was given blood thinners for a blood clot in her head, and is still taking them as a precautionary measure. While her doctor says she's in excellent health and fit to serve as president, her health constantly comes under question as the coughing worsens. Woman confronts Hillary Clinton about her health During a campaign event in Burlington, Iowa, a woman asked a question regarding Clinton's health. She referred to the FOX news statement that the democratic presidential candidate 'was really not equipped to be in the White House,' because she was ill. After rolling her eyes, this is what Clinton replied: 'Oh my. Well, you know, they say nearly anything about me. I've got to tell you,' Clinton, replied with a smile, referring to FOX News. 'There are several themes they keep beating the drums on. I'll match my endurance against anybody,' she said to loud applause. 'And last spring, my doctor put out a letter and you know, said what great health.' But is she as fit as she claims, or are these coughing fits a sign of a massive hidden health problem? 