Hillary Clinton suffered a massive fit of coughing in the middle of her speech on Monday, which fuelled doubts that she was unfit to become the next U.S. president because of her poor health, WND reported.

Clinton had to stop in the middle of her campaign speech in West Des Moines, Iowa because of her uncontrollable cough. A video taken during her speech has made the rounds on YouTube. Daily Mail posted a footage of the said coughing incident, where it showed the politician on stage struggling to catch her breath.

The U.S. presidential candidate had to pause from her speech to drink water. However, even after taking a few gulps, the 68-year-old continued to cough. Her coughing was also heard from the microphone placed in front of her.

Based on the video below, Clinton's cough lasted for more than 30 seconds. It started to subside after she took a cough drop. Clinton was finally able to continue with her speech afterwards, albeit in a hoarse voice. She also had to clear her voice multiple times in the middle of her speech. However, she also managed to joke about the situation on stage, which the crowd cheered and applauded to.

Clinton's massive coughing fit on stage immediately trended on Twitter. One user commented on how the politician's cough was more interesting than her speech. Meanwhile, another Twitter user said Clinton was choking on her own lies during her campaign speech.

Her massive coughing fit on Monday came after her health was questioned during a speech rally in Clinton, Iowa on Saturday, Jan. 23. According to ABC News, a woman from the crowd asked the politician to comment on a report from FOX News claiming that she is unfit to be the next U.S. president because she is ill.

The woman's question reportedly drew laughter from the crowd. Meanwhile, Clinton gave the query a smile and an eye roll. She also suggested that people shouldn't believe everything they hear about her on the news.

"Oh my. Well, you know, they say nearly anything about me. I've got to tell you. There are several themes they keep beating the drums on," she said according to ABC News.

Clinton likewise addressed concerns over her health during her campaign speech in Clinton, Iowa. She reportedly assured the crowd of 450 people that she was willing to match her endurance against anybody. She also updated her supporters on her current health condition and revealed that her doctor sent out a letter confirming that she was in "great health."