Hillary Clinton's cough reappeared Friday morning.

The Democratic presidential nominee choked up during a Florida speech on national service and had to pop a cough drop as she was approaching her big finish.

'We love you, Hillary!' an audience member shouted, giving her time to recompose herself. 'Thank you!!' Clinton replied.

She coughed once more and cleared her throat three additional times before she fully recovered.

At the end of her remarks, as she was headed for the exit, Breitbart News noted that Clinton had to reach out for her lead Secret Service agent's arm and steady herself for a moment before she descended down the steps.

It was the second time this week Clinton lost the struggle to control her voice in public. Since developing pneumonia, she's had coughing fits several times and observers have noticed strangeness about her gaze.

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Hillary Clinton's cough reappeared Friday morning. 'We love you, Hillary!' an audience member shouted, giving her time to recompose herself. 'Thank you!!' Clinton replied

Clinton is seen left unwrapping a cough drop and, right, putting the sweet in her mouth

Clinton pops the cough drop as she reaches the end of her speech in Florida on Friday

Clinton covered her mouth briefly to cough as she spoke to reporters on board her plane Tuesday.

It interrupted a claim of triumph in the debate, which many had been watching avidly for clues as to her true state of health.

Clinton successfully lasted the full 95 minutes of the event - which over-ran by five minutes - and it was Trump's persistent sniffing which was widely noticed.

Her health was not raised by Lester Holt, the debate moderator, and Trump also refrained from directly discussing it.

At the end of her remarks, as she was headed for the exit, Clinton had to reach out for her lead Secret Service agent's arm

Steady as we go... pic.twitter.com/F9kynAWOlO — Charlie Spiering (@charliespiering) September 30, 2016

Instead he raised it after Holt asked him about a previous comment, that Clinton did not have 'the presidential look'.

'She doesn't have the look. She he doesn't have the stamina,' he said.

'You have so many different things you have to be able to do and I don't believe Hillary has the stamina.'

Since developing pneumonia, she's had coughing fits several times and observers have noticed strangeness about her gaze. She's seen above in an ABC News video clip of her gaggle with reporters Thursday

Clinton drew attention to her health the next morning and again on Friday at an event in Fort Pierce as she was overcome with coughing.

'When you listen to what's being said in this campaign, it can be discouraging right?' she was saying. 'Now I am well aware that candidates don't usually focus on national service in the final stretch of a hotly-fought presidential election.

She added, 'Some might say, "Well, hey my gosh, you've only got 39 days to go, why aren't you just out there beating up your opponent and doing everything to get the vote out and all the rest of it? Well, I'll do that.'

Interrupted by clapping and laughing, she paused briefly, before she continued. 'I've been thinking about this for a long time, and I did not want this campaign to end without talking about it because it means a lot to me.

As Clinton delivered the line her voice grew hoarse. 'I'm trying to end the campaign talking about issues that are really close to my heart. And this is one of them,' she said, opening coughing and clearing her throat at the end.

Returned: Clinton went 95 minutes without coughing on Monday night but it resurfaced in a brief conversation on Tuesday morning on her campaign plane

Holding on: Clinton took a firm grip of the rail as she climbed the steps to her campaign's Boeing 737 at White Plains Airport, near her Chappaqua, NY, home

Even after she unwrapped the throat lozenge and put it in her mouth she had trouble speaking.

'You know for me service is really all about fulling the instruction of my Methodist faith, and you can see,' she said, clearing her throat once more, 'part of the creed I like to follow behind me.'

Some observers, including conservative radio host Hugh Hewitt, had suggested that one of the major elements of pressure on Clinton in Monday night was to avoid coughing.

He had told MSNBC: 'She has so many things she can't do. She cannot cough, she cannot laugh with the distinctive Hillary laugh, she cannot shout like she did at her supporters last week and she cannot condescend.'

At the debate Clinton pushed back on Trump's statement about her 'stamina.'

She recited exploits as secretary of state: travels to 112 countries, negotiations on peace deals, cease-fires and imprisoned dissidents — even the 11 hours she spent testifying before a congressional committee investigating the Benghazi situation.

Once Trump can do all that, said Clinton, 'He can talk to me about stamina.'

The health questions, however, are unlikely to go away.

Clinton's collapse at the New York 9/11 memorial service led to her finally revealing a diagnosis of pneumonia, and that she had had surgery in January without it being disclosed.

Her eye movements have also raised questions, with her two eyeballs moving in apparently different directions.

There was no sign of that at the debate, or of any apparent vision problems, but she held the handrail of her plane gingerly on Tuesday morning.