She said she had to put “myself and my well-being” first.

Live Nation reports that the singer was in the hands of an expert medical care team that are “working closely with her so she can continue to perform for her fans for years to come.”

Concert dates in London – where Gaga was supposed to play tomorroe, February 4th –  Manchester, Zurich, Cologne, Stockholm, Copenhagen, Paris and Berlin have been pulled. Live Nation said ticket holders will be able to get a refund from 6 Feb.

“I promise I will be back in your city, but for now I need to put myself and my well-being first. I love you, forever,” Lady Gaga tweeted.

Fibromyalgia, a chronic disease of the rheumatolgical system, causes pain, weakness and exhaustion.  It was the reason the singer canceled a concert in Rio de Janeiro last September, citing pain severe enough that she had to be hospitalized.

If you can wait long enough, Gaga has a 74-date residency in Las Vegas at the MGM Park Theater that is scheduled to start late this year.