She was photographed coming out of her daughter Chelsea’s apartment in New York last week with a strange protrusion coming from underneath her jacket.
Some on social media were also quick to point out her upright posture and bundled up clothing despite the warmer temperatures in New York.
‘(Hillary) looks to be wearing some sort of back brace – weird protrusion and scarf (80 degrees in NYC) up to her chin,’ one Twitter user wrote.
‘Is Hillary wearing a back brace now? Something was not natural about her posture and bundled up clothing. Weird!’ another person tweeted.
Hillary also opted for a long jacket and scarf when she took to a stage in New Zealand on Monday.
She was photographed sitting overly upright in her chair while she was being interviewed in front of the crowd.
During public appearances earlier this year, Clinton was spotted wearing a cast after breaking her wrist when she slipped in a hotel bath.
Clinton also had to wear a surgical boot at various points late last year after she fell down some stairs in her heels and broke her toe.
The former presidential nominee is currently touring Australia and New Zealand as she hosts a series of talks about being a women in politics.
Clinton was joined on stage in Melbourne on Thursday by Australia’s first and only female Prime Minister, Julia Gillard.