Donald Trump has sparked dementia concerns after he was spotted drinking water with two hands like a small child - days after he slurred his words during an Israel policy speech.

Twitter went into meltdown on Monday after the president took the awkward swig of water while unveiling his new national security strategy in front of military service members in Washington, D.C.

While some suggested he was cradling the glass or 'president sippy cup' because of his 'tiny hands', Twitter was quick to play amateur diagnostician and raised concerns the movement could be evidence of a serious degenerative disorder, such as dementia, which can cause shaky hands.

Donald Trump has sparked dementia concerns after he was spotted drinking water with two hands like a small child

Sandra F Woodward wrote that Trump 'holds that water glass like my 3 year old grandson holds his cup! I really think Trump has dementia and is reverting 2 childhood action.'

'THE WAY HE IS GRABBING THAT GLASS SHOWS TRUMP HAS DEMENTIA. HIS MOTOR SKILLS ARE DEGENERATING,' added Joseph Fedorko‏.

It's not the first time Trump has been seen drinking strangely.

In November, he picked up a bottle of Fiji water in both hands and sipped it awkwardly during a press conference at the White House.

And earlier this month, speculation went wild after Trump began slurring through part of his speech announcing changes to America's Israel policy.

He finished his remarks by saying 'God bless the United Shhtates. Thank you very much-sh.'

Conspiracy theorists on Twitter launched into high gear, including Democratic partisans who speculated about every possible cause from a mini-stroke to cocaine use.

TV host Joe Scarborough also weighed in, saying 'people close to him during the campaign told me [he] had early stages of dementia'.

A White House spokesman insisted the president merely had a case of 'dry mouth,' telling the Los Angeles Times that 'his throat was dry. There's nothing to it.'

Asked if Trump had any related health concerns, Shah said: 'I know what you're getting at. I'm saying there's nothing to it.'

But brain doctor Dr Ford Vox - who has never examined Trump - believes the incident and other moments in his presidency, reveals that Trump has all the symptoms of predementia.

In a lengthy analysis for Stat News, he also pointed to times when Trump has contradicted himself, rambles in interviews, makes faces, and forgets to sign bills at bill-signing ceremonies as 'worrisome symptoms' of illness.

In an attempt to regain control of the runaway story, press secretary Sarah Huckabee Sanders announced that Trump will undergo a physical examination early next year, with the findings released to the public.

LET IT FLOW: In November, he picked up a bottle of Fiji water in both hands and sipped it awkwardly during a press conference at the White House

Now, Monday's speech has reignited the rumors over Trump's health.

Twitter was awash with conspiracy theories within minutes of the 71-year-old's speech in Washington, where he told the servicemen and women: 'On January 20, 2017, I stood on the steps of the capital to herald the day the people became rulers of their nation again,' - before pausing to take a sip of water.

'Trump slurs ... that's not the give away. Holding a water bottle with two hands is. I suspect dementia or blood sugar swings. Noting the change in his speaking style and sentences suggest dementia or heavy drug use,' Matthew Milller Sr.‏ wrote.

Twitter user @KungFu_Grip added: 'My great grandmother who had dementia drank water like Trump did and barely ate before she passed away.'

While 'Evidence-Based Chuck E.‏' wrote: 'I use two hands on a glass when my hand shaking is out of my control (I have essential tremor). My guess is Trump is hiding that kind of shaking (or Parkinsons). Of course, that's also ME applying MY condition to him, so, take that for what it's worth.'

Tom Joseph‏ added: With today's speech, anyone can clearly see Trump's crumbling health. Slurring, sippy cup style water drinking, involuntary jerks & restricted eye mvmts on display-part of his dozen+ symptoms of Frontotemporal Dementia

'It's degenerative, highly progressive & worsening every week.'

Others joked the problem may just be Trump's hands.

'Are his hands too small to hold a glass? Is this why he uses both?' user @Tokenarino wrote.

'Can't someone please just get him a sippy cup!!!' Mark Callaghan added.

'That's exactly how my 2-year-old nephew drinks from a glass,' Twitter user @mcnultyruss tweeted.