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British singer Adele has been ordered by doctors to rest her vocal cords. (Matt Sayles/Associated Press)

British singer-songwriter Adele has called off her 10-city U.S. tour after suffering a vocal cord hemorrhage.

The Rolling in the Deep singer announced the cancellation Tuesday in a blog post.

"I have a hemorrhage again and it is paramount that I rest and therefore won’t be able to come and do these already rescheduled U.S shows which are due to start this Friday in Atlantic City," she wrote, apologizing to fans for the cancellations.

Earlier this year the Grammy-winner became the first recording act since the Beatles to have two top-five hits in both the U.K. Official Singles Chart and the Official Albums Chart simultaneously. Her song Someone Like You was a hit, in addition to Rolling In the Deep, both from her top-selling album 21.

But in June, she was forced to cancel nine North American tour dates (including Vancouver) because of laryngitis and, in September, she cancelled shows in the U.K. because of a chest infection. Just 23 years old, the singer says her relentless touring schedule has left her voice weak and that she has to rest it or risk permanent damage.

"Singing is literally my life, it’s my hobby, my love, my freedom and now my job. I have absolutely no choice but to recuperate properly and fully, or I risk damaging my voice forever," she wrote.

Tiny blood vessels in the vocal cords can burst because of the strain of singing. This causes a bruise on the vocal cords. Unless the area is allowed to heal — with no singing or even talking — there can be scarring, which can inhibit the vocal range of a singer.