The 22-year-old actress was taken to the Providence Tarzana Medical Centre in California by a friend on Tuesday after suffering "significant trouble" breathing, a source told gossip website TMZ.
The Skyscraper hitmaker is said to have been prescribed medication by a doctor after she was found to have a "flu-related" lung infection, and an insider told the publication she was also given an antibiotic known as Z-Pak.
Demi was thought to still be in the medical facility yesterday afternoon and her admittance meant she had to cancel a recording session for her new album with a "big producer".
The raven-haired star has previously spoken out numerous times about a "dark period" in her life during her younger years when she self-harmed, battled depression and eating disorders, and ended up in rehab.
Speaking in 2011, she said: "I basically had a nervous breakdown. I was really bad off. My parents and manager pulled me aside and said, 'You need to get some help.'
"It was an intervention. I wanted freedom from the inner demons. I wanted to start my life over.
"If you are going through that dark period, go to your family and closest friends.
"Don't put yourself in danger. It's very crucial that you get your feelings out - but don't ever inflict harm on your own body because your body is so sacred.
"I wish I could tell every young girl with an eating disorder, or who has harmed herself in any way, that she's worthy of life and that her life has meaning. You can overcome and get through anything."
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