(showbizspy.com) - Amy Winehouse has returned to the hospital after spending the weekend at home.
The Rehab hitmaker spent the past week being treated at the London Clinic. She left the hospital on Friday, but checked back in Monday.
A source says, "She had a chest infection [last week] and underwent some tests to make sure nothing else was wrong.
"She has been told to give up smoking and was initially struggling with that - she was covered in nicotine patches at one point. But she is making an effort."
Earlier this year, doctors diagnosed Amy, 25, with scarring of the lungs.
According to Winehouse's rep, Chris Goodman, the Grammy-Award winner has been recording tracks in her home studio for an upcoming album.