"I am thinking about it," Clinton said at a conference in San Francisco on Tuesday.
"The hard questions are not do you want to be president, or can you win," she was quoted as saying by local media.
"The hard question is why? Why would you want to do this and what would you offer that could make a difference?"
Clinton is widely believed to be running for the presidency in 2016. However, she has not made any formal announcement yet.
The former First Lady and US senator, who was defeated by President Barack Obama in the race for the 2008 Democratic presidential nomination, said she does not plan "to make a decision for a while".
She said she is "actually enjoying my life...seeing my friends and going on long walks and playing with my dog."
"I danced around that pretty well, did not I," she said.
Clinton recollected in the early 1990s when her husband Bill Clinton was elected president, they were worrying about how to get the economy going.
The power of the Internet was not just the dotcoms, she said.
"Even more important were the productivity gains that computing brought to all kinds of industries that were not thought high tech... That is the kind of innovation we need more of today," she said.
She expressed her disappointed that immigration reform is still a contentious issue.
"It should not be. It does not deserve to be. It is that kind of disappointment that really drives frustration and it is across the board," she said.
"It is not just the right thing to do. It is one of our competitive advantages around the world," she said.
Image: US President Barack Obama with Hillary Clinton and former president Bill Clinton in Washington, DC. Photograph: Win McNamee/Reuters.
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