The 58-year-old reportedly underwent ‘a scan for precautionary reasons’ at the Thousand Oaks hospital, which is nearby her Calabasas mansion.
According to reports, estranged husband Bruce Jenner flew from Miami to be at her side.
Bruce’s rush to comfort his ex-wife has fuelled rumours that the two may be getting back together.
Former Olympic gold medalist Bruce joined the Kardashian clan on holiday in Thailand and was spotted holding hands with Kris Jenner at LAX airport upon their return.
A source revealed to The Mirror: ‘When quizzed by reporters whether their hand-holding meant they were back together, Bruce even responded, 'We've been together', despite moving out of their Calabasas home into a rented pad in Malibu last year.’
Kris has also been spotted wearing her wedding ring, whereas Bruce refused to remove his despite the split.
The couple announced their separation in October last year following rumours that their marriage was in trouble.
Following the split, Kris revealed on US breakfast television: ‘We had been living apart. Bruce was living in Malibu, so I think (we decided) to just come out and say it formally to everybody at the same time… We're best friends. I mean, we talk all the time. Right now we're happier the way that we are right now.’