miley-cyrus-smoking-blunt.jpgTerry Richardson

Um WHAT?!

Miley Cyrus is on the cover of the latest issue of In Touch Weekly, and the magazine claims that the starlet is having a "secret medical crisis" related to the heart condition she was born with. And not only that, but the tabloid claims that the starlet's hard partying is only making the situation worse, and now her family is getting involved!

The headline reads, "Heart Attack Drama" and it notes that the "21-year-old star won't stop doing drugs," and that docs warn her, "Change your life or you'll die." That's a pretty big statement to make -- and this was also before the news broke that Miley was hospitalized on Tuesday after a severe allergic reaction to antibiotics.

Miley apparently suffers from tachyeardia, which causes a faster than normal heartbeat, and Dr. Mark Urman, who likely doesn't treat Miley, tells the mag, "She could get heart muscle problems and even heart failure at worst. She could even end up with a stroke." Another source tells the mag, "She knows she's not supposed to smoke pot or do drugs, but she does it anyway."

Sources close to Miley told TMZ she had an "emotional meltdown" after the death of her beloved dog Floyd two weeks ago, and after that she was "partying hard" to cope.

As you know, Miley was "placed on medical rest by her doctors" on Tuesday, forcing her to cancel her Bangerz Tour show in Kansas, and early this morning she tweeted, "the hospital is sayin i wont b released today therefore Im not going 2 make it 2 St Louis. Im so sorry but somethings are outta my control." Miley cancelled her show in Charlotte, North Carolina last week because she had the flu, so hopefully a few days off will get her back on track.