Cyrus sick again, delays European tour

There was much excitement when Miley Cyrus launched her "Bangerz" tour in Vancouver, British Columbia, in February, but since then the controversial singer has been beset by woes including ending up in the hospital with "a severe allergic reaction to antibiotics." Here are a few other issues that have cropped up along the way.

Katy Perry and Cyrus got in some smooching action during the latter's Los Angeles concert in February. Cyrus tweeted the lip lock, though the pair later got into a beef about the smooch when Perry questioned Cyrus' tongue hygiene during a radio interview in March. They later made up -- via Twitter, of course.

In April 2014, a "Bangerz" tour bus caught fire, according to Cyrus' younger sister, Noah, who chronicled the incident on Twitter.

Tragedy struck in early April with the death of the singer's favorite pooch, Floyd. Cyrus tweeted to her Boston fans in advance of her concert there that she was "beyond miserable." The gift of a new dog from her mother apparently did little to console her, as Cyrus later tweeted that she gave the new dog away to a friend.

On April 15, Cyrus was hospitalized for a "severe" allergic reaction to antibiotics reportedly taken for a bout with the flu and had to cancel some dates. "Kansas I promise Im as (heartbroken) as you are," the singer wrote. "I wanted so badly 2 b there 2night. Not being with yall makes me feel s**ttier than I already do."

• Miley's weekend shows in Amsterdam and Antwerp are rescheduled in June


• "After a period of improvement, Cyrus' symptoms have returned," rep says


• Cyrus still hopes to perform her "Bangerz" show at London's O2 Arena May 6


• Postponed North American shows are set for first two weeks in August

Los Angeles (CNN) -- The illness that derailed Miley Cyrus' U.S. tour in April has returned like a wrecking ball at the start of her European tour.

Cyrus' Friday and Saturday shows in Amsterdam and Antwerp have been rescheduled for June 20 and 22 because she suffered a setback in her battle against a "severe allergic reaction" to an antibiotic, her rep said.

The 21-year-old singer fell ill on April 15 and was kept in a Kansas City hospital for several days. The remaining North American shows in her "Bangerz" tour were postponed until August.

"After a period of improvement, Cyrus' symptoms have returned and doctors will not permit her to travel," her representative told CNN Wednesday. "This type of extreme reaction can last up to 27 days and Cyrus must remain under doctors' care at this time."

Cyrus is still hoping to perform her "Bangerz" show at London's O2 Arena on May 6, the rep said.

She initially became ill in early April with a flu-like illness, which caused her to pull out of her Charlotte show. After being prescribed the antibiotic Cephalexin, her health woes grew when an allergic reaction to the drug left Cyrus hospitalized for more than a week, according to a statement from her representative earlier this month.

By April 25 she seemed back to her old self. If her Instagram photos are to be believed, pancakes were a part of her recuperation.

CNN's Breeanna Hare and Carolyn Sung contributed to this report.