Cyrus, 21, came down with flu-like symptoms two weeks ago and was prescribed medication typically used as an alternative to penicillin, to which she is allergic. Unfortunately for the pop star, she also ended up being allergic to that treatment, and a severe reaction left her bed-ridden in a Kansas hospital for days.
"It was so scary," Cyrus told Ryan Seacrest in a radio interview Monday morning. "When you're allergic to something, you're literally poisoning yourself, so I had just been poisoning myself for a week with something I didn't know I was really, scary allergic to."
Not wanting to miss her Bangerz tour, Cyrus kept leaving the hospital, only to exhibit more symptoms and be rushed back.
"Being on the road, especially me, I'm not someone that wants to lay down and actually get 100 percent better," she explained. "It was like every two or three hours I would be OK, and then all of the sudden it would happen to me again. It was insane. I was begging the doctors, 'Let me out just to do the show,' but there was basically no way."
The upside? Cyrus rode in an ambulance for the first time and indulged in ice cream and food from Cracker Barrel while recuperating, though her boredom did create a style emergency.
"I was just laying there, I'm hooked to all these machines, every two hours some woman comes in and pokes me with a needle, and it's just miserable," she said. "I ended up doing way too much online shopping, and whatever they had me on to make me not in pain, I made very questionable choices about what I bought. I'm like, 'I don't know what this hot pink mini skirt is that I bought in the hospital.'"
Now at home in Los Angeles, Cyrus is preparing for the European leg of her tour and has rescheduled the canceled concerts for August.
Though her allergic reaction could last for up to 27 days, the "We Can't Stop" singer said she's feeling better and plans to be more careful in the future. Of course, any precautions must have have a very Miley flair.
"I'm trying to figure out out I can get a fashionable yet good ID bracelet so I can actually have something that says I'm allergic to this medicine," she quipped.