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The 25-year-old singer – who was hospitalized in June with a severe lung ailment – had a doctor visit her at home Thursday.
Then, over the weekend, "they wanted to do some tests as a precaution," her spokesman Chris Goodman told PEOPLE. "Obviously she had lung and chest problems which she had treatment for not so long ago, so they're just making sure."
Winehouse's father, Mitch, has previously said that the singer's lungs are "all gunked up" from smoking cigarettes and crack cocaine.
The troubled singer was taken to the London Clinic, where earlier this year she was treated for drug problems. "She's fine," Goodman said on Monday. "Should be back home today."
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