Miley Cyrus was hospitalized and had to cancel her concert in Kansas City Credit: Courtesy Miley Cyrus

Miley Cyrus' bad month just keeps getting worse. The "Wrecking Ball" singer, 21, was hospitalized on Tuesday, April 15, because of a severe allergic reaction to some antibiotics she was taking, a press release stated.

The release -- from Kansas City's Sprint Center, where Cyrus was supposed to perform her Bangerz tour show on Tuesday night -- said that the pop star had been "placed on medical rest by her doctors" and would not be able to go on as scheduled.

Cyrus herself tweeted a message to fans from her hospital bed, apologizing for the canceled concert. "Kansas I promise I'm as heartbroken as you are. I wanted to badly 2 b there 2night," she wrote. "Not being with yall makes me feel s---tier than I already do."

A follow-up tweet included a photo of the singer in a hospital gown, with a toy octopus partially covering her face. "Mr. Octopussy & some amazing Drs are taking good care of me," she wrote alongside the pic. 

Cyrus has been under the weather for a few days now. On Monday, April 14, she tweeted, "I woke up like disssss #SICK," followed by a message several hours later reading, "Fever fever go away." She has also been dealing with the grief of losing her beloved dog Floyd on April 1.