Having been discharged for only two days, Amy Winehouse has gone back to hospital for ongoing treatment.
The 25-year-old singer spent the past week being treated at the London Clinic. She left the hospital on Friday, but checked back in Monday."She had a chest infection [last week] and underwent some tests to make sure nothing else was wrong," a source tells PEOPLE.
"She has been told to give up smoking and was initially struggling with that - she was covered in nicotine patches at one point," says the source. "But she is making an effort."
The notoriously skinny singer was photographed looking somewhat fuller in the face last weekend - a healthier look that won praise from two British tabloids.
Despite her health woes, Winehouse has been recording tracks in her home studio for an upcoming album, her London-based rep, Chris Goodman, tells PEOPLE.
The 25-year-old has even been learning to play the drums, he adds. "We'll have to see how that plays out on the next album."
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